Automatic posting for subscontracting

Dear experts,

We have two different kinds of finished goods comes from subcontracting process. One is marketing product , another is Technical product. Problem is conversion charge for both types of product goes to one single GL mentioned in OBYC transaction ( Transaction FRL - External activity).

I need to segrigate posting of subcontracting for marketing product and Technical product, how is it possible.

Kindly help.

Best regards,,

Zusen