Can it be done? So far, I've had only partial success in doing so. I'm using custom item pickups in my map, and in order to prevent the health packs from being overridden by the Halloween style ones, I tried copypasting them into the props_halloween folder and saving them with the same filenames as the stock models. They showed up where I expected them to be in Hammer, but in game, everything was normal. I thought maybe packing them was the key, so I tried that. No dice. Surely this is a thing you can do somehow. What am I missing?