diff --git a/libs/event-emitter/src/event-emitter.module.ts b/libs/event-emitter/src/event-emitter.module.ts
index 02bd75d..7b212d1 100644
--- a/libs/event-emitter/src/event-emitter.module.ts
+++ b/libs/event-emitter/src/event-emitter.module.ts
@@ -18,6 +18,7 @@ import { IssuesService } from './issues/issues.service';
 import { IssuesController } from './issues/issues.controller';
 import { TimestampEnhancer } from './issue-enhancers/timestamps-enhancer';
 import { EnhancerService } from './issue-enhancers/enhancer.service';
+import { RootIssueSubTreesWidgetService } from './project-dashboard/widgets/root-issue-subtrees.widget.service';
 
 @Module({})
 export class EventEmitterModule implements OnModuleInit {
@@ -40,6 +41,7 @@ export class EventEmitterModule implements OnModuleInit {
         IssuesService,
         TimestampEnhancer,
         EnhancerService,
+        RootIssueSubTreesWidgetService,
       ],
       exports: [
         EventEmitterService,
@@ -54,6 +56,7 @@ export class EventEmitterModule implements OnModuleInit {
         IssuesService,
         TimestampEnhancer,
         EnhancerService,
+        RootIssueSubTreesWidgetService,
       ],
       controllers: [MainController, UsersController, IssuesController],
     };
diff --git a/libs/event-emitter/src/project-dashboard/widget-interface.ts b/libs/event-emitter/src/project-dashboard/widget-interface.ts
new file mode 100644
index 0000000..2f00e79
--- /dev/null
+++ b/libs/event-emitter/src/project-dashboard/widget-interface.ts
@@ -0,0 +1,4 @@
+export interface WidgetInterface<W, D, R> {
+  isMyConfig(widgetParams: W): boolean;
+  render(widgetParams: W, dashboardParams: D): Promise<R>;
+}
diff --git a/libs/event-emitter/src/project-dashboard/widgets/root-issue-subtrees.widget.service.ts b/libs/event-emitter/src/project-dashboard/widgets/root-issue-subtrees.widget.service.ts
new file mode 100644
index 0000000..894879e
--- /dev/null
+++ b/libs/event-emitter/src/project-dashboard/widgets/root-issue-subtrees.widget.service.ts
@@ -0,0 +1,82 @@
+/* eslint-disable @typescript-eslint/no-namespace */
+import { IssuesService } from '@app/event-emitter/issues/issues.service';
+import { RedmineTypes } from '@app/event-emitter/models/redmine-types';
+import {
+  TreeIssuesStore,
+  TreeIssuesStoreNs,
+} from '@app/event-emitter/utils/tree-issues-store';
+import { Injectable } from '@nestjs/common';
+import { WidgetInterface } from '../widget-interface';
+
+export namespace RootIssueSubTreesWidgetNs {
+  export namespace Models {
+    export type Params = {
+      rootIssueId: number;
+      parentsAsGroups?: boolean;
+      groups?: GroupCfg;
+      statuses: string[];
+    };
+
+    export type GroupCfg = {
+      fromIssues: Group[];
+      fromIssuesIncluded: boolean;
+      showOthers: boolean;
+    };
+
+    export type Group = {
+      name: string;
+      issueId: number;
+    };
+  }
+}
+
+type Params = RootIssueSubTreesWidgetNs.Models.Params;
+
+@Injectable()
+export class RootIssueSubTreesWidgetService
+  implements WidgetInterface<Params, any, any>
+{
+  constructor(private issuesService: IssuesService) {}
+
+  isMyConfig(): boolean {
+    return true;
+  }
+
+  async render(widgetParams: Params): Promise<any> {
+    const treeStore = new TreeIssuesStore();
+    const rootIssue = await this.issuesService.getIssue(
+      widgetParams.rootIssueId,
+    );
+    treeStore.setRootIssue(rootIssue);
+    await treeStore.fillData(this.issuesLoader.bind(this));
+    let stories: TreeIssuesStoreNs.Models.GetFlatStories.Result;
+    if (widgetParams.parentsAsGroups) {
+      stories = treeStore.getFlatStoriesByParents();
+    } else if (widgetParams.groups) {
+      const fromIssues = widgetParams.groups.fromIssues.map((g) => g.issueId);
+      stories = treeStore.getFlatStories(
+        fromIssues,
+        widgetParams.groups.fromIssuesIncluded,
+        widgetParams.groups.showOthers,
+      );
+    }
+    return stories.map((s) => {
+      return {
+        data: s.store.groupByStatus(widgetParams.statuses),
+        metainfo: s.metainfo,
+      };
+    });
+  }
+
+  private async issuesLoader(
+    ids: number[],
+  ): Promise<Record<number, RedmineTypes.Issue | null>> {
+    const issues = await this.issuesService.getIssues(ids);
+    const res = {} as Record<number, RedmineTypes.Issue | null>;
+    for (let i = 0; i < issues.length; i++) {
+      const issue = issues[i];
+      res[issue.id] = issue;
+    }
+    return res;
+  }
+}
diff --git a/libs/event-emitter/src/utils/flat-issues-store.ts b/libs/event-emitter/src/utils/flat-issues-store.ts
new file mode 100644
index 0000000..a9b07a3
--- /dev/null
+++ b/libs/event-emitter/src/utils/flat-issues-store.ts
@@ -0,0 +1,181 @@
+/* eslint-disable @typescript-eslint/no-namespace */
+import { RedmineTypes } from '../models/redmine-types';
+
+export namespace FlatIssuesStoreNs {
+  export type IssuesLoader = (
+    ids: number[],
+  ) => Promise<Record<number, RedmineTypes.Issue | null>>;
+
+  export namespace Models {
+    export type ByStatus = {
+      status: string;
+      count: number;
+      issues: RedmineTypes.Issue[];
+    };
+
+    export type ByStatuses = ByStatus[];
+
+    export enum FindErrors {
+      NOT_FOUND = 'NOT_FOUND',
+      NOT_LOADED = 'NOT_LOADED',
+    }
+
+    export type FindResult = {
+      data?: RedmineTypes.Issue;
+      error?: FindErrors;
+    };
+  }
+}
+
+export class FlatIssuesStore {
+  private issues: Record<number, RedmineTypes.Issue | null> = {};
+
+  push(issue: number | string | RedmineTypes.Issue): void {
+    let id: any;
+    let data: any;
+
+    if (
+      typeof issue === 'number' ||
+      (typeof issue === 'string' && Number.isFinite(Number(issue)))
+    ) {
+      id = Number(issue);
+      data = null;
+    } else if (typeof issue === 'object' && typeof issue['id'] === 'number') {
+      id = issue['id'];
+      data = issue;
+    }
+
+    if (
+      typeof id === 'number' &&
+      !Object.prototype.hasOwnProperty.call(this.issues, id)
+    ) {
+      this.issues[id] = data;
+    }
+  }
+
+  async fillData(loader: FlatIssuesStoreNs.IssuesLoader): Promise<void> {
+    const ids = [] as number[];
+    for (const id in this.issues) {
+      if (Object.prototype.hasOwnProperty.call(this.issues, id)) {
+        const issue = this.issues[id];
+        if (!issue) {
+          ids.push(Number(id));
+        }
+      }
+    }
+    const data = await loader(ids);
+    for (const id in data) {
+      if (Object.prototype.hasOwnProperty.call(data, id)) {
+        const issue = data[id];
+        if (issue) {
+          this.issues[id] = issue;
+        }
+      }
+    }
+    return;
+  }
+
+  getIds(): number[] {
+    return Object.keys(this.issues).map((i) => Number(i));
+  }
+
+  getIssues(): RedmineTypes.Issue[] {
+    return Object.values(this.issues).filter((i) => !!i);
+  }
+
+  hasIssue(id: number): boolean {
+    return Object.prototype.hasOwnProperty.call(this.issues, id);
+  }
+
+  loadedIssue(id: number): boolean {
+    return this.hasIssue(id) && !!this.issues[id];
+  }
+
+  getIssue(id: number): FlatIssuesStoreNs.Models.FindResult {
+    if (!this.hasIssue(id)) {
+      return { error: FlatIssuesStoreNs.Models.FindErrors.NOT_FOUND };
+    } else if (!this.issues[id]) {
+      return { error: FlatIssuesStoreNs.Models.FindErrors.NOT_LOADED };
+    } else {
+      return { data: this.issues[id] };
+    }
+  }
+
+  isFullLoaded(): boolean {
+    return Object.values(this.issues).indexOf(null) < 0;
+  }
+
+  groupBy(
+    iteratee: (issue: RedmineTypes.Issue) => string | number,
+  ): Record<string | number, RedmineTypes.Issue[]> {
+    const res = {} as Record<string | number, RedmineTypes.Issue[]>;
+    const items = this.getIssues();
+    for (let i = 0; i < items.length; i++) {
+      const issue = items[i];
+      const key = iteratee(issue);
+      if (!Object.prototype.hasOwnProperty.call(res, key)) {
+        res[key] = [];
+      }
+      res[key].push(issue);
+    }
+    return res;
+  }
+
+  groupByToStories(
+    iteratee: (issue: RedmineTypes.Issue) => string | number,
+  ): Record<string | number, FlatIssuesStore> {
+    const res = {} as Record<string | number, FlatIssuesStore>;
+    const rawData = this.groupBy(iteratee);
+    for (const key in rawData) {
+      if (Object.prototype.hasOwnProperty.call(rawData, key)) {
+        const issues = rawData[key];
+        res[key] = new FlatIssuesStore();
+        for (let i = 0; i < issues.length; i++) {
+          const issue = issues[i];
+          res[key].push(issue);
+        }
+      }
+    }
+    return res;
+  }
+
+  groupByStatus(statuses: string[]): FlatIssuesStoreNs.Models.ByStatuses {
+    const res = [] as FlatIssuesStoreNs.Models.ByStatuses;
+    for (let i = 0; i < statuses.length; i++) {
+      const status = statuses[i];
+      res.push({ status: status, count: 0, issues: [] });
+    }
+    const groupedIssues = this.groupBy((issue) => issue.status.name);
+    for (const status in groupedIssues) {
+      if (Object.prototype.hasOwnProperty.call(groupedIssues, status)) {
+        const issues = groupedIssues[status];
+        const foundItem = res.find((i) => i.status === status);
+        if (!foundItem) continue;
+        foundItem.issues.push(...issues);
+      }
+    }
+    for (let i = 0; i < res.length; i++) {
+      const item = res[i];
+      item.count = item.issues.length;
+    }
+    return res;
+  }
+
+  groupByStatusWithExtra(
+    iteratee: (issue: RedmineTypes.Issue) => string | number,
+    statuses: string[],
+  ): Record<string | number, FlatIssuesStoreNs.Models.ByStatuses> {
+    const res = {} as Record<
+      string | number,
+      FlatIssuesStoreNs.Models.ByStatuses
+    >;
+    const groupedIssues = this.groupByToStories(iteratee);
+    for (const key in groupedIssues) {
+      if (Object.prototype.hasOwnProperty.call(groupedIssues, key)) {
+        const store = groupedIssues[key];
+        res[key] = store.groupByStatus(statuses);
+      }
+    }
+    return res;
+  }
+}
diff --git a/libs/event-emitter/src/utils/tree-issues-store.ts b/libs/event-emitter/src/utils/tree-issues-store.ts
new file mode 100644
index 0000000..8a1bc25
--- /dev/null
+++ b/libs/event-emitter/src/utils/tree-issues-store.ts
@@ -0,0 +1,183 @@
+/* eslint-disable @typescript-eslint/no-namespace */
+import { RedmineTypes } from '../models/redmine-types';
+import { FlatIssuesStore, FlatIssuesStoreNs } from './flat-issues-store';
+
+export namespace TreeIssuesStoreNs {
+  export namespace Models {
+    export namespace GetFlatStories {
+      export type Item = {
+        metainfo: Record<string, any>;
+        store: FlatIssuesStore;
+      };
+
+      export type Result = Item[];
+    }
+  }
+}
+
+export class TreeIssuesStore {
+  private rootIssue: RedmineTypes.Issue;
+  private flatStore: FlatIssuesStore;
+
+  setRootIssue(issue: RedmineTypes.Issue): void {
+    this.rootIssue = issue;
+    this.prepareFlatIssuesStore();
+  }
+
+  async fillData(loader: FlatIssuesStoreNs.IssuesLoader): Promise<void> {
+    await this.flatStore.fillData(loader);
+  }
+
+  getFlatStore(): FlatIssuesStore {
+    return this.flatStore;
+  }
+
+  private prepareFlatIssuesStore(): void {
+    this.flatStore = new FlatIssuesStore();
+    this.flatStore.push(this.rootIssue);
+    if (this.rootIssue.children && this.rootIssue.children.length > 0) {
+      this.fillChildrenFlatIssuesStore(this.rootIssue.children);
+    }
+  }
+
+  private fillChildrenFlatIssuesStore(
+    childrenIssues: RedmineTypes.Children,
+  ): void {
+    for (let i = 0; i < childrenIssues.length; i++) {
+      const issue = childrenIssues[i];
+      this.flatStore.push(issue.id);
+      if (issue.children && issue.children.length > 0) {
+        this.fillChildrenFlatIssuesStore(issue.children);
+      }
+    }
+  }
+
+  isFullLoaded(): boolean {
+    return this.flatStore.isFullLoaded();
+  }
+
+  getFlatStories(
+    fromIssues: number[],
+    fromIssuesIncluded: boolean,
+    showOthers: boolean,
+  ): TreeIssuesStoreNs.Models.GetFlatStories.Result {
+    const res = [] as TreeIssuesStoreNs.Models.GetFlatStories.Result;
+
+    for (let i = 0; i < fromIssues.length; i++) {
+      const fromIssue = this.flatStore.getIssue(fromIssues[i]);
+      if (!fromIssue.data) continue;
+      const store = new FlatIssuesStore();
+      this.putIssuesToStore(
+        store,
+        fromIssue.data,
+        fromIssues,
+        fromIssuesIncluded,
+      );
+      res.push({
+        store: store,
+        metainfo: this.createMetaInfo(fromIssue.data),
+      });
+    }
+
+    if (showOthers) {
+      const othersStore = new FlatIssuesStore();
+      res.push({
+        store: othersStore,
+        metainfo: this.createMetaInfo(this.rootIssue),
+      });
+    }
+
+    return res;
+  }
+
+  private putIssuesToStore(
+    store: FlatIssuesStore,
+    rootIssue: RedmineTypes.Issue,
+    fromIssues: number[],
+    fromIssuesIncluded: boolean,
+  ): void {
+    if (fromIssuesIncluded) {
+      store.push(rootIssue);
+    }
+    if (!rootIssue.children || rootIssue.children.length <= 0) {
+      return;
+    }
+    for (let i = 0; i < rootIssue.children.length; i++) {
+      const childIssue = rootIssue.children[i];
+      const issueData = this.flatStore.getIssue(childIssue.id);
+      if (!issueData.data) continue;
+      if (fromIssues.indexOf(issueData.data.id) < 0) {
+        this.putIssuesToStore(
+          store,
+          issueData.data,
+          fromIssues,
+          fromIssuesIncluded,
+        );
+      } else {
+        if (fromIssuesIncluded == false) {
+          store.push(issueData.data);
+        }
+      }
+    }
+  }
+
+  private createMetaInfo(issue: RedmineTypes.Issue): Record<string, any> {
+    return {
+      title: `${issue.tracker.name} #${issue.id} - ${issue.subject}`,
+      rootIssue: {
+        id: issue.id,
+        tracker: issue.tracker,
+        subject: issue.subject,
+      },
+    };
+  }
+
+  getParents(issue: RedmineTypes.Issue): RedmineTypes.Issue[] {
+    const res = [] as RedmineTypes.Issue[];
+    let parentId: number;
+    let parentIssueData: FlatIssuesStoreNs.Models.FindResult;
+    let parentIssue: RedmineTypes.Issue;
+    parentId = issue.parent?.id;
+    while (parentId) {
+      parentIssueData = this.flatStore.getIssue(parentId);
+      parentIssue = parentIssueData.data;
+      if (!parentIssue) break;
+      res.push(parentIssue);
+      parentId = parentIssue.parent?.id;
+    }
+    return res;
+  }
+
+  getFlatStoriesByParents(): TreeIssuesStoreNs.Models.GetFlatStories.Result {
+    const stories = [] as TreeIssuesStoreNs.Models.GetFlatStories.Result;
+    return this.fillFlatStoriesByParents(stories, this.rootIssue);
+  }
+
+  private fillFlatStoriesByParents(
+    stories: TreeIssuesStoreNs.Models.GetFlatStories.Result,
+    rootIssue: RedmineTypes.Issue,
+  ): TreeIssuesStoreNs.Models.GetFlatStories.Result {
+    if (!stories) {
+      stories = [] as TreeIssuesStoreNs.Models.GetFlatStories.Result;
+    }
+    if (!rootIssue) {
+      rootIssue = this.rootIssue;
+    }
+    if (!rootIssue.children || rootIssue.children.length <= 0) {
+      return stories;
+    }
+    const store = new FlatIssuesStore();
+    for (let i = 0; i < rootIssue.children.length; i++) {
+      const child = rootIssue.children[i];
+      const childIssueData = this.flatStore.getIssue(child.id);
+      if (!childIssueData.data) continue;
+      store.push(childIssueData.data);
+      this.fillFlatStoriesByParents(stories, childIssueData.data);
+    }
+    stories.push({
+      store: store,
+      metainfo: this.createMetaInfo(rootIssue),
+    });
+    return stories;
+  }
+}
diff --git a/src/app.module.ts b/src/app.module.ts
index 6f3a43d..810ba7f 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -36,6 +36,7 @@ import { DailyEccmReportsUserCommentsDatasource } from './couchdb-datasources/da
 import { DailyEccmUserCommentsService } from './reports/daily-eccm-user-comments.service';
 import { SetDailyEccmUserCommentBotHandlerService } from './telegram-bot/handlers/set-daily-eccm-user-comment.bot-handler.service';
 import { DailyEccmWithExtraDataService } from './reports/daily-eccm-with-extra-data.service';
+import { Eccm110DashboardController } from './dashboards/eccm110-dashboard.controller';
 
 @Module({
   imports: [
@@ -53,6 +54,7 @@ import { DailyEccmWithExtraDataService } from './reports/daily-eccm-with-extra-d
     MainController,
     CurrentIssuesEccmReportController,
     DailyEccmReportController,
+    Eccm110DashboardController,
   ],
   providers: [
     AppService,
diff --git a/src/dashboards/eccm110-dashboard.controller.ts b/src/dashboards/eccm110-dashboard.controller.ts
new file mode 100644
index 0000000..09eaddd
--- /dev/null
+++ b/src/dashboards/eccm110-dashboard.controller.ts
@@ -0,0 +1,32 @@
+import { RootIssueSubTreesWidgetService } from '@app/event-emitter/project-dashboard/widgets/root-issue-subtrees.widget.service';
+import { Controller, Get } from '@nestjs/common';
+
+@Controller('eccm-1.10-dashboard')
+export class Eccm110DashboardController {
+  constructor(
+    private rootIssueSubTreesWidgetService: RootIssueSubTreesWidgetService,
+  ) {}
+
+  // TODO: code for Eccm110DashboardController
+
+  @Get('/raw')
+  async getRawData(): Promise<any> {
+    return await this.rootIssueSubTreesWidgetService.render({
+      rootIssueId: 2,
+      parentsAsGroups: true,
+      statuses: [
+        'New',
+        'Closed',
+        'In Progress',
+        'Re-opened',
+        'Code Review',
+        'Resolved',
+        'Testing',
+        'Wait Release',
+        'Pending',
+        'Feedback',
+        'Rejected',
+      ],
+    });
+  }
+}