How to add Second Stage Dealer information in GRN report.

Hi… all of you

I am trying to add second stage dealer info in GRN report .This information is only for knowledge purpose.The problem which i am facing is that ,i have already added those information in Purchase Table .Now for GRN it must be availabe in Purch. Rcpt. Header and Purch. Rcpt. Line. But i have to copy these fields without impacting on inventory.Please tell me the way to copy info from Purchase header to Purch. Rcpt. Header.

Thank you.