The Parent Server controls all def updates and other settings for the client. Unless the client is having issues talking with the Parent, even then as long as it has talked at one point, it should have all the settings controlled already.

You can even go into the Symantec Console and reset all the clients once you set everything how you want it.

Note though that your Parent and Primary Servers need to have the same or newer version of SAV then the clients, otherwise you'll run into issues with the certain features not working correctly when the client is newer.