There have been at least two clarification bulletins on this subject in the last day or two. I believe the latest is GCUS-14-829.
How is your dealership complying with these requirements? For all practical purposes this is nearly an impossible request - at least for us.
Who does it? Your office / cashier, how will they know when to use it - parts, has no access to repair order - service, they don't always know if a part is not GM. We don't always tell service if we substitute an insignificant small part such as a generic length of hose or a hose clamp, etc.