Posted 18 January 2016 - 04:32 PM
Hopefully this is what you are after, it turns out you don't actually need PowerShell as he functionality is built into the tool.
1. In Studio click Delivery Groups on the lefthand menu
2. Right click Edit delivery group
3. Select Machine allocation tab on the left
4. Click Export list
5. Select a file name > Click Save
6. Create the new machine catalog
7. Right click the delivery group > Click Edit
8. Select Machine allocation tab on the left
9. Click Import list..
10. Select the list you exported in step 4
11. Click Apply
Your clients will now have users re-assigned to machines.