Yes, changing the domain name from yourdomain.com to yourdomain2.com can be done through HELM.

** WARNING - This procedure will delete any e-mails, e-mail accounts, databases and any other associations with the domain name you are deleting.

We strongly advise backing up all you can before continuing.

To change domain names:
1) Login to your control panel
2) Click "Domains"
3) Click the domain name you wish to change/remove
4) Now click "Delete" (Please read warnings above).
5) You should be at the Domains screen again
6) So now click "Add New"
7) Choose the package to which to add this domain (used if you have more than 1 package with us.
8) Type in the domain name without www. and .com/.net/.org etc.. in the second box
9) Click 'Save"

This will now recreate your new web space, email accounts and everything else.