I am setting up my store and using variant inventory for colors and sizes in t-shirts with some items in stock and some back orders..

 It asks for status, ie: in stock, back order, etc...., but when I publish my item, it shows all of it as IN STOCK, when certain sizes or colors are marked as backorder or out of stock. I'm sure once I get my store up and running and start forwarding my current customers there, that we will make sales, but I am worried I will be selling items that are out of stock and wont be printed for weeks. Do I have to list inventory items as seperate items for the different statuses to work properly, or is there some setting I can apply so certain sizes or colors show up as out of stock or give a back order option?