CO-PA reporting - summarization

Hello everybody.

I have the following task:

We have SD BOM, which consists of Material A - it's a header, Materials B and C - they are sub-items.

During releasing billing documents, we have the following line items in CO-PA:

Material (A, B, C) Revenue COGS Etc..

The question is - what is the possibility to summarize the values of Revenue and Cogs from sub-items Materials (B and C) up to the header material A.

Thanks in advance,

Medved99