free goods problem

Hi,

I require free goods in quotation. For example If i enter 10 qty in quotation. The billing should be done only for 9 qty (10-1) for inclusive case.

and for exclusive case an addition line item should be generated with 1 quantity

1 is free good quantity.

The same thing should be copied to sales order, IF i create sales order with reference of quotation.

Kindly help me if any body is having an idea.

Thanks&Regards

(YUGANDHAR.P)