how to create various mini sites or have a dynamic menu

Hi, I want to create various mini sites for real estate. Each mini site is a featured property which has pages with diverse content (location, gallery, schools, transport, etc).
I purchased a real estate theme and have most of the things figured out, I just don’t know how to create a dynamic menu for each property with links to the specific pages for each property.

Does anyone have an idea how can I make this project more efficient and make each mini site a template that I can duplicate and the links and pages update themselves for each mini site?

I hope I am clear enough ??

thanks!