Domain aliasing allows multiple domains to point to the same site. So your site can be opened with many different domains at no extra cost, as long as you have already registered them.
To create a domain alias from within Plesk, follow these steps:
1. Log in to Plesk with your credentials.
2. On the Websites & Domains tab, select, Add domain Alias.
3. On the Add a Domain Alias tab,
Domain alias name : state the alias domain (1) for the domain : Select the domain name to which you want the alias to redirect  (2) Leave the following fields default except for Redirect with the HTTP 301 code which is optional, as this way search engines when they find the alias address will automatically redirect to the main domain address, invalidating the alias - Synchronize DNS zone with the primary domain - to synchronize the DNS service. - Mail Service - When email is sent to an email account of the domain alias, you will receive it in the corresponding mailbox of the domain. E.g. if they send you an email to the address info@newalias.gr you will receive this email to the address info@mydomain.gr. - Web Service - so that you have all the Web Services of the domain. - Redirect with the HTTP 301 code Click OK (3)