restricting resources coming into APO

Hi

We have three work centers, A, B &C, on a production line and we produce multiple materials. However not every resource is a bottle neck in production of every material.

For example

to produce material M1, work center A may be bottleneck, B and C are not

to produce another material M2 work center C may be bottleneck, A and B are not.

We need to create the routing/master recipe with all three work centers but want to send only bottle neck work center A into APO's SNP PPM/PDS for material M1 and only work center C into APO's SNP PPM/PDS for material M2.

Please advise how this could be done.

Thanks.