Business Objects XIR2

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?