Manage domains that are not used to create the site and can be mirrors of the main site in section "Files → Aliases "
Domain aliases allow you to provide access to your website under a different domain name
To use domains as aliases, they must be registered by a valid registrar and configured to connect to your DNS servers.
The alias root directory does not change and is in the public.html folder.
After adding an alias, you can add a redirect from it to any other domain. To add a redirect, click "Redirect Management ":
Enter the domain you want the redirect to go to and click "Save ":
A similar error can occur if the domain you specify with the alias is already added to the server.
If you add an already working domain as an alias, i.e. with a site, the site will simply stop working. And that address will display the main site for your cPanel account.