Need to exclude 2 location from macro while calculating independent Req

Hi All,

I have a scenario and need help in finding solution.

Have 1 product belong to 4 location A,B,C and Z

Lane is from Z to A

Lane is from Z to B

Lane is from Z to C.

So distribution demand comes from A,B, C to Z.

while calculating independent Req I want to consider Dis. Dmd coming from C but don't want to consider Dis. DMD coming from A and B.

Please suggest me possible solution.

One possible solution which i can think of is to exclude Location A and B from Macro while calculating independent Re, but don't know much about macro.

Please Help me with possible solution , or how to exclude it using macro.