A query regarding your products

Hey,

I have the full membership and just now am finally able to start using these plugins for multisite and had a quick question about a specific need. Essentially I am setting up a multisite network for a business with multiple franchises around the country, the idea is to have a main site which houses the content which is identical across all franchises, but then give each franchise its own child site, each following a specific theme, but retaining the header and footer of the parent site. The shared content (header and footer) would all ideally be centralized so if I needed to change something it would change across the whole network. in your impressive list of plugins is there a combination of them that will push me in the right direction here? Thanks for your help!!