Manage DNS on remote host

I am in the process of transferring the registration of similarly named domains (e.g., .net, .org) to DH. I want to use DH to manage these domains (e.g. DNS info, etc), however, I want the content of “.com” to remain at the other hosting location. Should I use mirror, redirect, or some other domain setup? The other site is only identified by its IP address. I’ve read the wiki and forums, but cannot find the answer. I’ve already setup “redirect domain” for the “.net” and “.org” domains to point to “.com”. Thanks.