How to set up DNS to only add aliases?

[Itai Tavor]

Hi,

I'm a complete newbie when it comes to DNS... my ISP has set up DNS
records for my domain, and I want to add aliases to my web server so I
can use apache's named virtual hosts. How do I set up my DNS server so
it only creates the aliases, without interfering with the domain
records at the ISP? A complete example of the required config files
would be greatly appreciated.

Thanks

Itai Tavor