How to set up two nameservers from the same domain?

Question

Domain Name System

Hello.
The question is next.
Here's what is needed:
There are two servers.
There is one domain.
The name servers for the first one are already configured, of the form ns1.my.ru
ns2.my.ru
For the second server, you need to configure the name servers for the same domain, that is, of the form ns3.my.ru
ns4.my.ru
Of course, ns1.my. ru
ns2.my.ru
should park domains on the first server,
and ns3.my.ru
ns4.my.ru,
respectively, on the second.
Is it possible?
Thank you.