Hi,
I want to give a discount to some products (price->option) if a special product is chosen (1 of 2 products -> price -> product and then as type radiobutton). I hope you understand me.
I think this post goes in the right direction:
http://www.gravityhelp.com/forums/topic/deduct-delivery-fee-before-adding-sales-tax#post-38429
But I don't understand the code very well. I can't adept it to my situation.
Best regards.