dns zone to point a subdomain to a name based account before propagation

I have a customer who wants to test his new sites on my server before changing his nameservers. He's asking me to set it up so that sub.domain.com directs traffic to the account for domain.com on my server (name based domain on a shared ip).

He has already made the changes on his end so that sub.domain.com sends traffic to my server, but once here it arrives at the shared ip and shows the default apache page.

How can I get the traffic to go to the domain.com account?

I have CPanel/WHM and root access.

Thanks.

Scott

 

 

 

 

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