Hi WM,
I haven't worked on such requirement, found below links. Might be of some help to you.
http://scn.sap.com/thread/1438359
http://www.erpgreat.com/sapscripts/sample-sapscripts-label-printing-program.htm
http://scn.sap.com/thread/575959
http://scn.sap.com/thread/1412877
Regards,
DN