title: How to use Azure PowerShell script to publish package to web app virtual application in VSO
body: <p>I see the new Build definitions of Visual Studio Online have not supported 'Azure WebApp Deployment build step' to deploy Virtual Application (Sub site).<br/>
  So I try on using 'Azure PowerShell build step' but couldn't find out the script. <br/>
  I also tried this tutorial: <a href="https://msdn.microsoft.com/en-us/library/azure/dn642480.aspx?f=255&amp;MSPPError=-2147217396" rel="nofollow noreferrer">https://msdn.microsoft.com/en-us/library/azure/dn642480.aspx?f=255&amp;MSPPError=-2147217396</a>
  But stuck in step generate folder called PublishScripts. Because I've already created Azure WebApp and VSO Project, not starting at a blank. </p>
  
  <p><strong>Updated:</strong>
  I've solved by creating &amp; upload a custom tfx build task based on ps msdeploy.exe</p>