Thank You all very much.
mmccarn :: Thanks for the clarification. What you have proposed is what i thought might be the requirement, but looks more like how one would configure a ProxyPass for a whole domain.
janet :: Thanks, but i will clarify my exact requirements so you understand all i am trying to do.
I currently have the domain (and subdomains) running successfully internally. The 'www.' is pointing to the ibay, 'ftp.' is pointing to the ftp machine (with port forwarding for incoming traffic from the internet), the 'orders.' is pointing to a separate machine running a web based database. The mail services are running on the SME server/Gateway. Basically all i am trying to do is expose only the 'orders.' subdomain for the http:// and https:// services to incoming traffic from the internet. I would like all else to remain the same. This includes leaving all other domains and services i have running on the SME Server/Gateway unaffected.
The other issue that is a little unclear, is :: do i need to remove the currently defined domain from the control panel, or just the SubDomain to which we will apply the ProxyPass. And once a ProxyPass is applied, will i be able to manage the other elements of the domain from the control panel?
Once again, thank you all very much.