Multiple Cubes being Source of a Single Cube

Hi,

Is there a way to use multiple Cubes as the source for one Cube ?

In details, i have same Cube created over multiple data marts.

The data volume I'm working with is rather large  (in the Terabytes), so i would prefer not moving the Data back to a separate DB and union there.

Example:

Cube over project A

Cube over project B

MASTER CUBE has Fact Table : Cube A Fact UnionCube B Fact

And of course same for the dimensions, even though dimensions are, size wise, manageable so they can be replicated at the other "Master" Cube.

Is there a way to link to multiple Cubes and basically union the fact table from each in another Cube ?

therefore just taking advantage of space already taken by the individual project specific Cubes.

Any advise on how to approach this problem is helpful.