Configurable Sub Assembly Replacement with Variant

Hi Sappers !!!

I am trying to make a cycle contains the following materials

A   KMAT

A1     finished product variant

     B   KMAT

     B1  Semifinished variant

          C1 RAW MATERIAL

          C2 RAW MATERIAL

I wanted to build the structure to fill the characteristics of the finished product and for subassembly if a variant is found the configurable semi finished B to be replaced by the variant B1 and if the configuration is not calling a variant the configurable subassembly B is choosen in configuration and Planned order is placed for the configurable finished order and finished subassembly.