Create Domain Aliases in Plesk
1. Click on “Website & Domains” tab
2. Click on “Show Advanced Operations” link
3. Click on “Domain Aliases” icon
4. Click on “Manage” link to the right of the domain you want to set up an Alias for.
5. Click on “Add Domain Alias” icon
6. Fill out the needed information. The ones denoted by a red asterisk is a required field and press the OK button.