Hi DRMERLA.
Yes it is possible.
Kindly see this link on how to configure GUP's for your clents.
http://www.symantec.com/business/support/index?page=content&id=TECH96419
Alsp kindly see this link on how to verify if client are receiving updates from the GUP.
http://www.symantec.com/business/support/index?page=content&id=TECH97190
Hope this helps.
Thanks,