Best Practice of using Oracle AR for one business unit for two or more brands.

I  would like to know the "Best Practice" of using Oracle AR for one business unit but for for two or more brands. Oracle AR module is already setup and running in our business but from time to time we have acquisitions and we need to implement new AR module in Oracle. New businesses are almost identical with the existing business unit except that when we generate aging and other standard reports we would like to seperate by brands. Company balancing segments are different between brands. Access should be limited to users based on brands. Tax maybe different also for