Total Pricing Support

Question, I am new to Open Cart and am having a lot of fun with it. Great program. I have created 2 options on a product. I was wondering if there was a possibility to create different shipping prices per option. For an example, I have the same item featured but have a option for different sizes. 50/foot roll, 100/foot roll, .... So when the buyer chooses 100/foot roll, how do I change the shipping costs. Thank you and I apologize is this is not the correct place to post.

When you add the option to the product, you can choose whether it adds or subtracts a price. Try adding an option to the product and you should see how to do it.