Product Option Request

I'd like to request a product option that would allow the addition of waste as a percentage of the total sale in square feet. For example, if a customer were to purchase hardwood flooring by the square foot, it would be nice to give the customer a choice to add a waste percentage, like 5 or 10 %. This is fairly typical in the flooring industry.

Thanks,

there is a very good modification you can use to do that: http://forum.opencart.com/viewtopic.php ... 70&start=0

Thanks Florinsith for sending me in the right direction.