We have quantity discounts per item. But they are the same across every item.
So for example we offer
10% discount when a customer purchase 50 or more
15 % for over 80
20% for over 100
But this needs to be per line.
So if they purchase 100 ITEM A they get the 20% discount but just for that product
If they purchase another 10 of another item there should be no discount for that product
I can see the price rules, but that seems to be linked to the total number of products in the order. So in the example above they would get 20% discount on the 10 off