Adding a Sub-Domain in Plesk 11
One of the unique instances within our control panel is the synchronization of the http://manage.myhosting.com control panel and the Plesk control panel. When adding a domain to the manage.myhositng.com panel it allows you to add the domain to the Plesk subscription creating the domain within the Panel instance.
With the domain added to plesk all DNS, Sub-Domain creation, and domain related functions are managed by the Plesk panel at this point.