I was just wondering if there is a way to add new columns to the shopping cart (ie where it says item, qty, description ect). I went to setup > website > setup website and under the cart tab it lists out all the columns but I don't see a place on there to add a column. Is this even possible?

I wanted to add a quantity on hand column so customers know if its in stock or maybe just be able to put a script there that tells if its in stock based on the quantity.