BuddyPress.org

Hello, I have Buddypress Installed and Multisite Network aswell. When Im assigning buddypress pages to an actual page I cant seem to pick the Sub Domain I want. This is what I want http://www.durtymindz.com/ is the website and I want the Buddypress stuff on http://community.durtymindz.com/ but the Buddypress bar at the top of every site I make. I want to also have it where all users together no matter the Sub domain site you go to. I am having problem trying to figure this out so if anyone can help it would mean alot.

EDITED: Like I want the Buddypress Admin bar to be shown on all Multisite. My main site just normal theme though and want community.durtymindz.com for the buddypress pages and to have the theme a buddypress theme.