Semi-Finished triggers Finished good planning

Hi,

I'm using strategy 70 to use PIRs and start the planning of a semifinished good.

Is there a way to trigger the planning of the finished good regarding what's have been planned for the semi-finished? (Think a MRP in the other way).

I have included too the FG in the SF BOM, as a not relevant for costing item.

Thanks

Regards

Francisco Oyarzo