Hi..
It is possible to allocate costs from Business Process to Products using Activity Allocation.
You check whether you specify the method of price calculation and allow recalculation of
actual activities with actual prices again through the following IMG path : Controlling->Activity-Based Costing->Planning->Maintain Version.
Refer to SAP Help Portal Site : Actual Price Calculations - Activity-Based Costing (CO-OM-ABC) - SAP Library