title: Powershell provisioning new site with unique permissions but uses existing owners group
body: <p>Currently run in to a bit of a stumbling block and i don't know if i am searching for the right thing on google to get the correct results to help me.</p>
  
  <p>The situation....
  1)In sharepoint via the GUI i can use unique permissions when setting up a site.
  2)You are then presented with a page showing 3 possibilities(Read, Contribute and owner) of groups.
  3)In these possibilities you can select to use an existing group or create a new one.</p>
  
  <p>The setup i am looking for is use existing group for owner and create 2 new groups for contribute and read. How do i do this in powershell?</p>
  
  <p>The other way i have thought about doing this is to not break permissions, Delete all the groups apart from the owners groups, Create 2 new groups, assign them contrbute and read and add them to the site. &lt;- this sounds like it would work but also sounds like a workaround! </p>
  
  <p>Cheers
  Truez</p>