Creating a Domain Alias through version 4 of the Helm Control Panel is quite simple and very similar to version 3.
Log into Helm as Admin, and on the main window, click the icon for My Domains.
Click on the domain you would like to create the alias for.
Click the icon for Domain Aliases.
Currently, there are no Aliases created for this domain. Click Add in the upper left-hand corner.
Type in a name for the Domain Alias, making sure to leave off the ‘www’. Once entered, click Save in the bottom right-hand corner of the screen.
You have successfully created a Domain Alias.