Copying Website to another domain (Plesk 12)
Note: You need to create a subscription before using this option. Adding a Domain (Plesk 12)
Select Subscriptions in the left hand panel
Select Domain name to move website files from
Click on Websites and domains tab at the top of the screen.
Click on Show More Option until you can see additional options.
Click on the Website Copying
Select the destination subscription. Click OK to submit