I have a need to have the order options, when checked, be part of the shipping cost, and not be added to the subtotal. I have been looking for quite some time but cannot find where to begin. Any hints or examples?
I am able to select the tax class that these order options are in, I just want to have their value reflect that difference. When I choose shipping tax class, I would like the value to show in the shipping cost on top of any other shipping cost.