Walkthrough with Screen Shots
Log into your GoDaddy account, go to your hosting manager and select the domain name for the main account on the Premier Hosting account.
In the "Settings" section, select Domain Manager.
In the Domain Manager, add the domain you want to host on its own site and wait for the setup to complete - takes about 10 minutes.
The walkthrough has details and screen shots. I think it's pretty well covered, but don't hesitate to contact me if you don't understand something.
If you can't see the "Step 1" image in the walkthrough in Firefox, try it in IE. For some reason new .jpg images are reluctant to appear in Firefox on my workstation, so I never know until I get home if they're actually viewable to anyone else - they usually are.
Lynda