Change URL to XML sitemap

Hello,

How do I change my url to xml sitemap in Infinite SEO?

My site is about things to do in each city. When I start a new city I copy the files and the database and move it to a subdomain. Then I go and change the city name in all the files. If I was to start from scratch on each city it would take WAY TOO MUCH TIME thus a failed project.

I need to change from:

calgary.paintedthetown.com/sitemap.xml

to

boston.paintedthetown.com/sitemap.xml