title: How to design workflow
body: <p>I need to create a workflow where a user would send emails to either 1 or multiple depending on how many they are available on the account from the dropdown recipients. </p>
  
  <p>I started creating a workflow but got stuck can a thread group contain sub-thread group at one of the endpoints? If so how? Need some example.</p>
  
  <p><strong>Requirement</strong>: The design should accept a single user / multiple users and each of the users can send emails to single recipients or multiple recipients</p>