For example you want to store some value for each member of the dimension DIMX
For BPC MS you will use the property approach and FLD function.
For BPC NW you will store the values:
DIMX: SOMESPECIFICMEMBER
Other dimensions:
DIM1: D1DUMMY
DIM2: D2DUMMY
DIM3: D3DUMMY
...
Then use tuple expression in REC from my previous post.
Vadim