Hi Bond,
If i get you clearly, Your Multiprovider has cubes for e.g USA, China, Canada etc..
you can restrict only your USA cube in the query.
Dimensions--> Infoprovider --> drag only USA Cube.
By doing so only the values from the USA cube will be shown.
For MP you do not need any transformation/DTP. just select the cubes needed and the fields required and then assign each field to get info from the cube.
Copying of INfo provider is simple.
On the current MP--> Context Menu --> select/deselect the cubes and name it.
Hope it helps
Regards,
Sudhir.