Hi,
thanks for the reply.
In the attached pic you can see that you have 5ml or 10ml to choose.
I want to make an offer that when the customer takes eg. 4 products from 10ml, then the 4th one will have the price of eg. One cent. (3 + 1 offer). This works.
Unfortunately, when the custmer takes 3x 10ml + 1x 5ml, Presta reduces the price of the 5ml to one cent.
I want to know how I can tell Presta to differenciate the volumes, so the offer will be valid only for one kind of volume.
Thanks in advance!