SUBTRACTION ()
Basic Overview
Description  Subtracts nodes by rolling them up to the same set of levels (intersect). The result has the coarser level of each shared dimension of the input nodes. 
Signature  Node1  Node2 
Parameters 

Examples
The Subtraction works exactly as the opposite operation to the addition.
We recommend to add all costs as negative values, hence you will not need the subtraction often.
Node A
Year  Value 

2017  5 
2018  10 
Node B
Year  Product  Value 

2017  A  2 
2018  A  3 
2018  B  4 
AB =
Year  Value 

2017  52 = 5 
2018  10(3+4) = 3 