Newbie question - restrict number of a certain game piece

Hi, I’m brand new to design and trying my hand at creating a module for Dual Powers.
I’m using the Monopoly module for examples.
I want to have a limited number of a certain counter.
I was checking the Monopoly module and trying to see how they limit the number of hotels to 12 but can’t find it.
Any help would be appreciated.

one way would be to create 12 hotels in a “at start” stack. don’t have clone or delete on the piece. Don’t have it in a “game piece pallet” where players can get to more.