I suppose that would work, but then the customers don't know the weight of the product (some are heavier than others, and it's important to know this because some products will be carried all over the place by the customer (car seats, etc)... So that's not a good solution. Plus that won't show what they are getting discounted. (it's nice to show "$23 Off!) or something like that, depending on the weight.
So I assume it could be done the same way you would add a discount percent to only SOME items, right? Why would it be different? I just can't figure out how to do it. How do you assign certain items with a value? (I know it was said to add a column to the cart, and then in the add to cart button for those that you want the discount for, put this value in it, but the add to cart button is showing on a list of items that are generated based on the database, not by me manually adding the button). So how would I do this?? Or am I way off track here... (very possible! :)