SimpleMultipart/src/test/resources/assets/multipart_test/multipartstates/iron_slab.json

{
	"variants": {
		"half=top": { "model": "multipart_test:multipart/slab/iron/top" },
		"half=bottom": { "model": "multipart_test:multipart/slab/iron/bottom" },
		"inventory": { "model": "multipart_test:multipart/slab/iron/bottom" }
	}
}