In the "Upgrade package for Groups" function give the option to have the clients update from a Group Update Provider (GUP)

I haven't found a way yet to update my clients at other locations using the GUP.  It only gives me the option of upgrading from the managment server or a URL.    Does this mean that to update the package I have to use the push deployment wizard and push the new package everytime?  This should be able to be done from SEPM.