var app = angular.module('plunker', []);

app.controller('FirstCtrl', function($scope) {
  this.name = 'FirstCtrl';
});

app.controller('SecondCtrl', function() {
  this.name = 'SecondCtrl';
});

app.controller('ThirdCtrl', function() {
  this.name = 'ThirdCtrl';
});
<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.2.x" src="https://code.angularjs.org/1.2.25/angular.js" data-semver="1.2.25"></script>
    <script src="app.js"></script>
  </head>

  <body>
    
    <div ng-controller="FirstCtrl as first">
      <p>{{first.name}}</p>
      
      <div ng-controller="SecondCtrl as second">
        <p>
          {{first.name}}<br/>
          {{second.name}}
        </p>
        
        <div ng-controller="ThirdCtrl as third">
          <p>
            {{first.name}}<br/>
            {{second.name}}<br/>
            {{third.name}}
          </p>
        </div>
      </div>
    </div>
    
  </body>

</html>
/* Put your css in here */