OPM Cost Component Class

At OPM Cost management i need to separate the Material cost component class for Finished Goods into two components one for Raw Material and the other for all packing material but as we know at the fiscal policy the material cost component class is assigned from there so it’s one only if anyone have a solution regarding to this issue  

I need item cost at Item Cost Form to be as follows 

Material Raw = X

Material Packing =X

Resource Equipment=x

Resource Labor=X

Expense Allocation=X

Note. i am using 11i OPM and the costing methode is PMAC