Show aggregated value at total row.

Hi All.
I am stuck up with an MDX query where I am trying to create a calculated member.
The scenario is like this
there is a measure Materials and workcenter in Row area. and costcentercount in data area.
For every material there are related workcenters.

Note : MAterial and workcenter are from different dimension
aggcostcenter is a calculated measure

----------------------------------------------------
material | workcenter | CostCenter | aggcostcenter |
----------------------------------------------------
205 | 808 | 3 | 3
---- | 809 | 4 | 7
---- | 810 | 6 | 13
----------------------------------------------------
---- | total | -- | (Here I want to Display 13)
---------------------------------------------------
206 | 607 | 6 | 6
---- | 608 | 4 | 10
----------------------------------------------------
---- | total | -- |(Here I want to Display 10)
------------------------------------------------------
Grand total
---------------------------------------------------------
so on....
Any help would be greatly appreciated
Satish