How to fetch Quantity in CO11N from Result Recording during Inprocess Inspection (03)?

Hi,

I have following requirement.

Suppose Process order quantity is 100 KG and when I am carrying out In process Inspection for 100 kg,I have to multiply Inspection Characteristic quantitative value (suppose 0.9) to Inspection quantity and that Quantity I want to fetch for Process Order Confirmation GR quantity i.e. 100*0.9=90

Please guide if their is any way to carry out this process.

Nitin