DNS Settings for multi server setup

Hey guys, I've 2 Cloudmin instances (one is currently GPL) and have a seperate VM to by my primary DNS to be accessible at dns1.example.com. Can't anyone help me or direct me in how to get cloudmin to create the DNS entries on the DNS1 primary server? I'm also not really understand the subdomain records and how to point to them from the primary server (ex. cloudmin.example.com or hosting.example.com) any help is much appreciated. Thanks guys!