Transfer of SFG Variance to FG Variance in COPA

Hi

We have Semi Finished Good A, which is used later in Semi Finished Good B,

SFG B is used to produce FG1, FG2, and FG3

we have to prepare Finished Goods wise Profit & Loss in COPA. All production variances are settled in CO-PA at the time of process order settlement. So SFGs and FGs variances are available in CO-PA.

The problem is that we have to transfer SFG variances to their respective FGs, because no line item / column is required in P & :L

Please help how can we transfer SFG varainces to FG variances?