• Login to Plesk control panel.
  • Go to Websites & Domains, click Add Domain option there.Add Addon Domain in Plesk
  • On the next screen, you need to type your domain name and location on the domain contents folder name.Add Addon Domain Plesk
  • At last click on the Ok button.
  • Now you can see your new domain name in your domains list.
Note:Addon Domain facility is available only for Business, Professional and Developer plan. This facility is not available in the Startup plan.