Using Plesk, you can add a domain to your dedicated or virtual dedicated server. In order to add domain names, you will need to have a Plesk license that allows you to create multiple domains.
To Add a New Domain in Plesk
Log in to Plesk as admin.
Select Domains.
Click Add New Domain. The client selection page displays.
Select the client you want to create the domain for, and click OK. The domain creation page displays.
Select the IP address that will be used to host this domain from the drop-down list.
If you want to set up hosting for this domain, check the "Proceed to hosting setup" check box.
For more information about setting up a domain in Plesk, you can take a look at the Plesk documentation on SWsoft's Web site:
Administering Domains
Creating a New Domain