Hello,
http://www.symantec.com/business/support/index?page=content&id=TECH93813
About configuring rules for multiple Group Update Providers
http://www.symantec.com/docs/HOWTO55244
Helpful Video’s:
https://www-secure.symantec.com/connect/videos/group-update-providers-part-1
https://www-secure.symantec.com/connect/videos/group-update-providers-part-2