This extension allows you to combine mix and match several options into one option with a specific price. So for example if you own a garment ecommerce site and you would like to sell Large(option1) Tshirt (product) of the color (option 2) Blue you may give users a a combined option which says Large-Blue (option 1+2) This extension is useful if your store has items with various properties but comes with a fix price for each of them. Check screenshots for further clarity