Multi Site - Multi Networks

Hey guys!

Dudes, I've got some trouble here, I'm going to change everything at my company and work with WPMU, but I´ve got some issues...

In my business I'm going to work with WPMU like this way:

One main site with multiple networks with each network with a main site with this own searh type.

So, I want the main site like Google, with a powerfull search engine (I was thinking about use the WPMUDEV Global Site Search) to the guest get a general seach across all networks, and if the guest wish to make a specific search he can go to that specific network that is about what he wants and make a specific search in that network.

Is there some way to do that?

Thanks Guys!

Derek Melo