Cubes with different dimensions based on the same fact table

I have a fact table (f_a) with three dimensions (dim_a, dim_b, dim_c) and a one measure (m_a).
Is it possible to create cube with only one dimension (dim_a)?
Data for other two dimensions (dim_b, dim_c) should be aggreagated together.
Of course i can create second fact table with only one dimension, and then creating that cube would be no problem.
But is it possible doing this directly from the primary fact table (without creating second fact table)?
Raf
PS:i use AWM 9.2 to create target cubes. Source cubes i create with OEM 9.2

At the beginning i was confused by the numberous kind of cubes...
for example when i created cube in MS i just designed cube, picked fact table, and that's all. In Oracle firstly i create project of cube (first cube) in OWB. Then i export it to the OLAP Catalog (second cube). That cube in OLAP catalog is a source cube for the AW cube (third cube). Then i need to enable AW cube for OLAPI by creating another cube in OLAP Catalog (i use 9iR2, so OLAPI doesn't have direct access to AW cubes).
I spent much time until i could see my first sample cube in Discoverer or Excel as a final user should see it. :-)
Now i'm facing another problem - when you redesign cube (for example add another dimension), you can't just "refresh" it as it was in MS. You have to delete old cube and create new one. And deleting cube isn't so simple (i'm not sure which elements i should delete).
For testing and learning purposes i just create every cube in seperate AW. deleting whole AW is much simplier that deleting one cube.
Raf

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