DNS records

I just set up a DNS server. I want it to point to my webserver with multiple websites using IIS 5.0. The problem im having at the moment is trying to set up ip pointing from my DNS server to my webserver. I have my sites on the same ip address with a backslash for my different web sites. how do i change the dns records to point to the ip address that i need with a backslash to differentiate different web sites