Ending local preferences can mean one of three different things:
That you want the machine to stop using its local client_info file for its server preferences and start using the preferences set for its subnet in the domain's global client_info table.
That you want this machine to stop using its local client_info file for its server preferences and start using the preferences set for it specifically in the domain's global client_info table.
That you do not want the machine to use server preferences at all. When a machine does not use server preferences, it obtains NIS+ information as described in Default Client Search Behavior.