Independent Buddypress community per sites

Hi, I'm building a network using Prosites, and I have a buddypress community in my main site, so if I make available themes like magazine will this use my buddypress community or will make possible the other's sites admin who's using the theme to build its own community?

What I want to know: can I have more than one buddypress communities per WPMU? Totally interdependent of my main site buddypress community, with other members and groups?