All items are in the same dimension and performance is of the highest priority.
How do you calculate the difference between item A and item B, and then store the result in item
C?

A.
Define C as sibling of A and B, and a rule [‘C’]=N:[‘A’]-[‘B’];.

B.
Define C as consolidation of A and B, B with a weight of-1.

C.
Define C as consolidation of A and B2, and a rule [‘B2’]=N:-[‘B’];.

D.
Define C as consolidation of A and B, and a rule [‘C’] = C: [‘A’]-[‘B’]:.

Explanation: