Partial allocation against sale order during allocation run

Hi Experts..

How to do allocation run for partial quantity against to the particular AFS sale order while doing allocation run process in J3AT.

Example :

I have sale order stock 10 qty. but I want to do allocation run for 5 qty. So that I can make partial delivery for this 5 qty alone. So please suggest me how to do partial allocation run.

Thanks in advance

Prabakar