Nested Routing

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('genius', { path: 'account/genius' }, function() {
    this.route('welcome', { path: '/' });
    this.route('opt-in');
  });
});

export default Router;

templates.application.hbs

<h1>Application</h1>
<ul>
<li>{{#link-to 'genius'}}Genius at root{{/link-to}}</li>
<li>{{#link-to 'genius.welcome'}}Genius at welcome{{/link-to}}</li>
<li>{{#link-to 'genius.opt-in'}}Genius at opt-in{{/link-to}}</li>
</ul>
<hr />
{{outlet}}

templates.genius.hbs

<h2>Genius</h2>
<hr />
{{outlet}}

templates.genius.opt-in.hbs

<h3>Opt In</h3>

templates.genius.welcome.hbs

<h3>Welcome</h3>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}