Nameservers but different server

Hi,

I am newbie on dedicated server

One of my reseller customer wants following ;
His main domain of reseller is abc.net on our server but he has abc.com which is on another server/company.

He wants to use namesersers of abc.com for his clients eith his account on our server ..
he did register ns1.abc.com & ns2.abc.com with our ip's at his registrar and i added those nameservers at our whm .....

is there anything to do?
should he need A record at his other server for abc.com ? if yes how?

Thanks guys

 

 

 

 

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