Site Copies

I’m not sure if this is the proper forum for this question but I have a rather unique requirement.

A client wants me to build his site which is a wedding site that has all kinds of vendors and information about weddings. Pretty straightforward until he said he is expanding into multiple cities.

So there’ll be beautifulbrides.ca/sudbury, beautifulbrides.ca/toronto etc.

Currently his site runs off texpattern which is the first thing that’s going to go. He’s been making copies of the site.. literally reinstalling the site everytime he wants to add a new city.

There must be an easier way to do this. I’m thinking one backend that manages multiple sites if that’s possible. At the very least one wordpress install.

Any suggestions?