As a UI software developer, I would structure an Angular NGRX application for an ordering system as follows:

1. Set up the Angular application with the necessary dependencies and modules.

2. Create a feature module for the ordering system, e.g., OrderModule.

3. Define the state, actions, and reducers for the ordering system.

4. Create selectors for accessing the state.

5. Implement components and services for the ordering system.

6. Set up routing for the ordering system.

Here's a more detailed breakdown of the structure:

src/
  app/
    order/
      components/
        order-list/
          order-list.component.html
          order-list.component.scss
          order-list.component.ts
        order-detail/
          order-detail.component.html
          order-detail.component.scss
          order-detail.component.ts
      services/
        order.service.ts
      store/
        actions/
          order.actions.ts
        effects/
          order.effects.ts
        reducers/
          order.reducer.ts