If you have a VPS, you can define the main nameservers in WHM. Then you have to go to your register, and create the actual nameservers there. So buy a domain like, abchost.com, create nameservers pointing to your servers IP, and point all your sites to those nameservers. Then on abchost.com make a site similar to
this one (its an example host, which I think belongs to Eli)