WHM: DNS Functions -> Edit a DNS Zone -> NS Record?
Hello,In WHM, I am wondering what DNS Functions -> Edit a DNS Zone -> NS Record is? It currently contains my servers nameservers, but I am wondering if I add a DNS zone as a subdomain of my site (i.e, forums.mydomain.com) and edit that DNS Zone so that the two NS Records point to another servers nameservers, will it be like a TLD with it's nameservers changed through the registar?
Hope that makes sense, if it didn't I will try and explain it better.

Thanks!