title: Angular Reactive Form: - Fill Input dynamically in Dynamic rows
body: <p>I am working on a Register module where User can add multiple channels, Like google, yahoo, outlook and custom. </p>
  
  <p><strong>Questions:-</strong><br/></p>
  
  <ol>
  <li>
  OnSelection of Custom Url field would be empty and in case of other domain url field would pre filled.
  </li>
  <li>
  If you select custom in domains then URl field needs to be blank and editable.  
  </li>
  <li>
  If I click on add more then form needs to be blank same like when page is getting load.
  </li>
  </ol>
  
  <p>I have created Dummy form at <a href="https://angular-db4rzu.stackblitz.io" rel="nofollow noreferrer">https://angular-db4rzu.stackblitz.io</a>. Looking for help.</p>