This feature slightly offsets each set of a multiple copy print job from one another in either the Offset Catch Tray or Stacker Tray. This often makes it easier to sort and handle documents when you are printing several copies.
To request offset printing:
Open the driver from your application's Print dialog Properties.
Select any desired print options.
Choose the Advanced Tab.
Expand the Paper/Output options and select Request Offset. Then choose Offset Each Set from the available options.
Click OK to return to the Print dialog.
Click OK to send your document to print.