title: Populate multiple cities in a single dropdown
body: <p>In angularjs using bootstrap/jQuery/html5, I want to populate a city based on state and populate, in turn based on country in a single dropdown. When cites come up, I want to select multiple cites. How can I do this?</p>
  
  <p><a href="https://i.stack.imgur.com/ImGiY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ImGiY.png" alt="enter image description here"></a></p>