How to setup WHM use 1 IP for all nameservers ? ( no reseller )

I am on VPS.
root account WHM.

main ip: 123.123.123.1
hostname: server.domain1.com
ns1 : ns1.domain1.com ( 123.123.123.1 )

I setup only primary DNS.
I don't want to use secondary DNS ( to save the IP).


I have clients account ( no reseller account )
domain2.com , domain3.com ...etc.


How to setup ns1.domain2.com use the same as main IP -->123.123.123.1 on WHM ?

ns1.domain3.com --> 123.123.123.1
ns1.domain4.com --> 123.123.123.1
...
..
etc.


We have to manual edit DNS zone ?

 

 

 

 

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