Multiple Collections

Does anyone know if there is a way to have multiple, seperate collections in Engine? I have 2 x SC6000 and 2 x LC6000s and the x1850 and when my brother comes over we go back to back using the 4 decks. However he normally uses Traktor with a controller. Engine can see his files but he can’t search his music with the search functionality unless we import his music into a collection! I would like for him to be able to import his music into an Engine collection seperate from mine, so he can properly search his music from the players using the search functionality. Is there a workaround for this functionality?

Just use an external hard drive for brothers collection. Still run that hard drive through Engine DJ desktop app to do all the analysis and library creation (which then gives searching ability)