Costume fields ad price

Hello,

How to make a costume field to add a 20,30,40% at the total price.
i can't use variants because they have allredy 3 fields in total 200 vars.

Thank's

That can be done with a quantity price calculation override plugin. We have some documentation on that in the developer documentation here:
www.hikashop.com/en/support/documentatio...tation.html#override