Can you please explain what is meant by quantity breaks? Are you saying about different increments for quantity or you talking about adding fractions?
Talking about functionality like in this app from Bold: https://apps.shopify.com/quantity-breaks
Basically, users should get different discounts based on the number of items in their cart.
Ex: let's say someone adds two protein shakes into their order, this makes them eligible for a 10% discount which is reflected in the cart page.
The same goes for 3 protein shakes and 15% discount and so on.
Discounts should be applied per-product and not for the total cart value.
Any advice or directions are highly appreciated (where to begin? can it be done with liquid? js? app? etc)