You can create an Ionic project by following procedure.

1. Click “Create New Project”
2. Click “Framework Templates”
3. Select “Angular” (not “AngularJS”)
4. Select “Ionic 3 + Angular 5 Starter”
5. Click “Create Project”

You may need to modify monaca:preview script in package.json to preview the app.

"scripts": {
    "ionic:serve": "ionic-app-scripts serve",
    "monaca:preview": "npm run ionic:serve -- --port 8080",
},

You should reload the preview tab every time you build because it seems not support live reload.

Hope it helps,
puku0x

Considering the data structure, it is needed to add a key for the array in selectedValue.

valuesList = [
  {
    name: 'foo',
    items: [
      { id: 1, title: 'title001', message: 'msg001', value: 'value001'},
      { id: 2, title: 'title002', message: 'msg002', value: 'value002'},
      { id: 3, title: 'title003', message: 'msg003', value: 'value003'},
    ]
  },
  {
    name: 'bar',
    items: [
      { id: 4, title: 'title004', message: 'msg004', value: 'value004'},
      { id: 5, title: 'title005', message: 'msg005', value: 'value005'},
      { id: 6, title: 'title006', message: 'msg006', value: 'value006'},
    ]
  }
];

selectedValue = this.valuesList[0];

Moreover, I don’t recommend to use ons-select with [ngValue] because it supports only string currently.

<select class="select-input" [(ngModel)]="selectedValue">
  <option *ngFor="let value of valuesList" [ngValue]="value">
    {{ value.name }}
  </option>
</select>

<ons-list>
  <ons-list-item *ngFor="let item of selectedValue.items">
    <h2>{{item.title}}</h2>
    <p>{{item.message}}{{item.value}}</p>
  </ons-list-item>
</ons-list>

Here’s a live demo.
https://stackblitz.com/edit/ngx-onsenui-topic-3319

Cheers,
puku0x

入れ子はこんな感じでしょうか？

  <ons-navigator>
    <ons-splitter>
      <ons-tab>

私も試したことはありますが、最新版ではうまく動きませんでした。
（v2.0.0 RC.17では動きました）