PIR at SFG to be reduced on sales order at FG

Hi,

We have a requirement to have a planning strategy so that PIR (Planned ind req) of SFG gets reduced for sales orders of FG. Planning strategy 40 reduces PIR for sales orders of same product . In our case , suppose B (SFG) is a part BOM of A (FG) , then PIR for B also should get reduced for sales orders of A.

Kindly advise how to achieve it.

Thanks in advance.

Regards,

Mrinal