What this guide covers
Choose one whole product and build a percentage ladder that stays within the 99-unit line limit.
Target one product
Quantity breaks reject specific-variant and collection targeting. Pick the whole product whose quantity should drive the offer.
Keep every step reachable
Each enabled minimum must be 99 or less. A per-product cap must reach the highest enabled step; a per-variant cap lets several variants contribute independently.
Use the right feature set
Quantity breaks support percentage steps and subtotal conditions, but not gifts or build-a-box sections.