Segregation of cost of material and process to different WBS

Hello All,

We have implemented the PP & PS for Assembly Processing. In this process when we are running MRP and generating reservation this will create planned order than this will converted to Production order. So after confirmation of this production order Cost of Raw material and cost Process execution is coming on single WBS.

Where our requirement is to segregate this cost to different WBS as Raw Material cost should come under Material WBS and Process cost should comes under Process WBS. so Project reports can show transparency of actual cost occurred.

currently we have CJI3 to check actual cost and this will manually transferred to required WBS using KB11N.

Please guide for Segregation of cost with in this process so we don't have to do manually steps to transfer this cost to different WBS.

Thanks

Sunil