SAMBA + Domain Group V's Users

How do you specify an NT domain group instead of just a user name in Samba. I.e. "smith" belogs to a group called "it", I can add "smith" as a valid user, but I would rather add "it". But "it" dowsnt work (ha ha)... Thanks for your help, Markus Bergh. ##################################################################################### This e-mail message has been scanned for viruses by our email server and cleared. #####################################################################################