Order Related Billing - Return

Dear SD Experts,

I want to do a return for a order related billing. E.g-

I create an order with a line item for qty 10. Billing is created for just 3 qty. Now I want to do a return of 1 qty out of the 3 that was invoiced. how do i return in order based billing. hope you got the problem clear. Pls advice on how to do solve this. Thanks in advance.