I make Carvings in Wood, Mostly Coat of Arms and most of theses are custom, so one of the choices a customer gets is the type of wood they want it made from. So I have 89 diiferent woods to choose from. I purchase them in different forms, Rough Lumber & Finish Lumber to name 2. So In my Cascading Downdrops, I Pick 1) wood, 2) Rough Lumber, 3) Black Walnut. No Problem.  Next order - 1)Wood, 2)Finish Lumber, 3)has no listing. Now I can either make a double listing of the wood spieces under Finish Lumber or this doesn't work. Then what if I need Plywood, then thats a 3rd problem.