framemarket / gridmarket poor documentation

My site is a Network, consisting of sub-sites - each sub-site will represent an area (geographical) in the States, and each sub-site will feature products.

Due to the poor documentation of FrameMarket / GridMarket, I am unable to do the following:
1. display structured categories of areas and sub-areas for sub-sites
2. display products from all the sites
3. Search for a product globally in all the sites.

Can someone help me out on this one?