Bind IP Address To Domain On Server

I’ve begun using a new server but am having an issue. Sometimes when I do subcontracted work I like to utilize one of my servers IP address’ to send to the contractor for proof etc…

In Plesk it was easy to select which domain was the default under any of the assigned IP addresses.

My new server doesn’t have this capability so I’m wondering if this is an easy task by modifying the apache config.

Anyone?