OBYC- FI/MM

Hi

I would like to split the amount of Inventory amount to two different accounts.

Current Entry:

Inventory Account Dr 10000

GRIR account Cr 10000

Desired Entry:

Inventory Account Dr 8000

Customs Duty Dr 2000

GRIR account Cr 10000

Assuming that it can be done with the help of General Modification in Transaction Key. If yes/no, pls guide me, how to do it.

Thanks

S