I'm looking for a way to set up registers that sell various items that can usually only be bought at rabbit holes, using draylson's Department Store Register which works by pulling the stocklist from buy mode categories or collections. So like, a register that sells specific fruits and vegetables, a register that sells specific books, etc.

For a specific example, let's say I wanted to make a farm shop that has a section for a butcher/fishmonger cash register that sells meat, fish, herbs, spices, cooking skill books and maybe a handful of decorate things for barbeques. So that would be a mix of things that are currently only available in the grocery store, the book store and the buy catalogue respectively.

I seem to remember one of the cooking overhaul mods knocking around out there added the ingredients from grocery stores to the buy catalogue but I'm not sure what that one was or perhaps I just imagined it.

Any leads would be appreciated! Including if there's a guide out there to attempt to make it possible myself.