Business Objects XIR2

Question

suppose if u have designed one universe for one product, u have 5 different customers for the that product, but each of customer has its own database, then how do u connect same universe with the different databases so that each customer gets access to only his own database? that means how do u manage the adminstration of that single universe so that each customer has access to only his own database with the same universe name?How do we manage this senario through CMC?