Plesk ::How to Rename a domain
Follow these simple steps to rename a Domain through Plesk:-
1) First click on that particular domain name on your Home page.
2) Now click Rename Domain.
3) Now type a new name for a domain in the Domain name field. Leave the www check box selected if you wants to allow other users to access your website by a common URL like www.my-domain.com.
4) Now Click OK. This operation can take few minutes, during which all domain services will be stopped.
Note:Since domain renaming involves modifying DNS records, allow up to 24-48 hours for DNS propagation after the renaming.