The promotional offer is a type of discount in euros or as a percentage that can be applied to one or more products and may be conditional on a quantity or number of products in the basket.
For example: in the basket there are 2 shoes and 3 laces, so there are 2 products and 5 quantities. It can be applied per product (on each) or on the order total.
WARNING: if you set the product/quantity condition, the offer will only apply to a line where there are several quantities.
The promotional offer is always cumulative on itself. -30% on the 2nd, then on the 4th, then on the 6th...
Example attached.