Alias domains are used when you have a domain that currently does not have any content on them but you want to point them to a site that does. You can use an alias domain when you have the same domain name but different extensions.
To add an Alias Domain to your account, you’ll want to log into cPanel. From there, click Aliases
You’ll be brought to a new screen where you’ll see your added aliases and add new ones. Add the Alias in the Create a New Alias section. Then click Add Domain
And that’s it! You can manage the new Alias you added in the Remove Aliases section.