Learn how to set up a subdomain redirect in Plesk. This method works for pointing subdomains to external sites.
1. Log in to your Plesk account.
2. Click on Websites & Domains from the Sidebar Menu.

3. Under the list of Domain names, click on the
Hosting Settings icon appearing in the same row of the subdomain.

4. Enter the following details:

5. Click Save. Read the warning and confirm it with Yes.
The subdomain has been successfully redirected to the external URL in Plesk. Visitors will now be taken to the new location automatically.