Windows 2003 External DNS Help?

[beornwulf]

Here is my situation:
Running IPcop Firewall/Router on DSL line
One ip address assigned from ISP to IPCop
Internal NAT network 10.x.x.x
DMZ NAT network 172.x.x.x

I have setup a Windows 2003 dns server on the DMZ network which is hosting an external domain that is registered.

I have setup port forwarding on the Ipcop router.

I have the

http://www.mydomain.net

resolving properly. I want to be able to setup other hosts, for example, test.mydomain.net to point to internal server that is sitting on the 10.x.x.x network. Can this be done on a DNS server??