Managed dedicated server at godaddy

So instead of listening to me they called godaddy and were sold with a low price, they did get a really cheap deal, less than I have ever seen but I knew they would regret it

I never set one up & thought it was managed and they would do everything but they do not and if try support they are not much help so thats why I am here.

So I have a domain I used to setup the server and when using whm to create another site I couldn’t just use the nameservers of the main site for all my new sites I create in whm and they said it doesn’t work that way but I know it does.

The client wants me to call godaddy for them and I kind of owe them as they are good clients but I am not dealing with godaddys support anymore. Where could I get details on how to set up cpanel & whm so all my new sites I add via whm all use the same nameservers?

Thought that was just the way it worked but I guess other hosts I have used do all that for you and just ask which nameservers I want to use and did it for me.

Any tips appreciated.