在Angular中，可以使用NGRX进行状态管理，并且可以使用多个存储来管理不同的模块或部分应用程序的状态。下面是一个解决方案的示例代码。

首先，安装必要的依赖项：

npm install @ngrx/store
npm install @ngrx/effects
npm install @ngrx/entity

然后，创建每个模块或部分应用程序的存储。

例如，假设我们有一个用户模块和一个订单模块，我们可以创建以下存储：

1. 用户存储：

// user.actions.ts
import { createAction } from '@ngrx/store';

export const setUser = createAction('[User] Set User');

// user.reducer.ts
import { createReducer, on } from '@ngrx/store';
import { setUser } from './user.actions';

export interface UserState {
  user: any;
}

export const initialState: UserState = {
  user: null,
};

export const userReducer = createReducer(
  initialState,
  on(setUser, (state, { user }) => ({ ...state, user }))
);

// user.selectors.ts
import { createSelector } from '@ngrx/store';
import { UserState } from './user.reducer';

export const selectUserState = (state: any) => state.user;

export const selectUser = createSelector(
  selectUserState,
  (state: UserState) => state.user
);

2. 订单存储：

// order.actions.ts
import { createAction } from '@ngrx/store';

export const setOrder = createAction('[Order] Set Order');

// order.reducer.ts
import { createReducer, on } from '@ngrx/store';
import { setOrder } from './order.actions';

export interface OrderState {
  order: any;
}

export const initialState: OrderState = {
  order: null,
};

export const orderReducer = createReducer(
  initialState,
  on(setOrder, (state, { order }) => ({ ...state, order }))
);

// order.selectors.ts
import { createSelector } from '@ngrx/store';
import { OrderState } from './order.reducer';

export const selectOrderState = (state: any) => state.order;

export const selectOrder = createSelector(
  selectOrderState,
  (state: OrderState) => state.order
);

接下来，将存储添加到应用程序的根存储中。

// app.module.ts
import { StoreModule } from '@ngrx/store';
import { EffectsModule } from '@ngrx/effects';
import { userReducer } from './user/user.reducer';
import { orderReducer } from './order/order.reducer';

@NgModule({
  imports: [
    StoreModule.forRoot({
      user: userReducer,
      order: orderReducer,
    }),
    EffectsModule.forRoot([]),
    // ...
  ],
  // ...
})
export class AppModule {}

最后，您可以在组件中使用这些存储。

// user.component.ts
import { Component, OnInit } from '@angular/core';
import { Store } from '@ngrx/store';
import { setUser } from './user.actions';
import { selectUser } from './user.selectors';

@Component({
  selector: 'app-user',
  template: `
    
User: {{ user$ | async }}
    Set User
  `,
})
export class UserComponent implements OnInit {
  user$ = this.store.select(selectUser);

  constructor(private store: Store) {}

  ngOnInit() {}

  setUser() {
    this.store.dispatch(setUser({ user: 'John Doe' }));
  }
}

// order.component.ts
import { Component, OnInit } from '@angular/core';
import { Store } from '@ngrx/store';
import { setOrder } from './order.actions';
import { selectOrder } from './order.selectors';

@Component({
  selector: 'app-order',
  template: `
    
Order: {{ order$ | async }}
    Set Order
  `,
})
export class OrderComponent implements OnInit {
  order$ = this.store.select(selectOrder);

  constructor(private store: Store) {}

  ngOnInit() {}

  setOrder() {
    this.store.dispatch(setOrder({ order: '123' }));
  }
}

以上是一个基本的示例，展示了如何在Angular中使用NGRX的多个存储来管理不同部分的状态。您可以根据实际需求进行调整和扩展。