[Q]Registering one of my domains as Name server?

[Kim]

Hi All,

I am having two domains. Domain1 is resolved with the assitance of  some DNS
server which is recognized by NSI
Now I'd like one host(Let's say  ns.domain1.com)  of my Domain1 to serve as
Primary Server  for Domain2.
Could anyone let me know  How to register ns.domain1.com  as Name server
with
NSI?

TIA