If you want a reusable drop down go into your store, click configuration, then find the mode you're working in, and click reusable dropdowns. Make sure you click it in the right mode you're in- otherwise whatever changes you make won't show up, don't ask how I know Then you just add what you need in there, hit enter/submit and then go onto the next one. If you want one that's specific to the product you're entering- then when you're on the add product page go all the way to the bottom where it says click to add drop down box (something to that effect anyway-lol) and then enter your information by line (this one is really useful if you keep inventory and are just selling in-stock items, if that makes sense) Hopefully that helps!