Stacked Discount

What it does: This discount groups related products together and applies volume discounts based on the total quantity.

How it works:

1. Grouping products: The system can stack items together in two ways:

   • By individual variant (e.g., "Red T-shirt Size M")

   • By product family (e.g., all colors/sizes of the same T-shirt style)

2. Checking quantities: Once grouped, the system counts how many items are in each stack and checks if they hit certain quantity thresholds (like "buy 3 get 10% off, buy 5 get 15% off")

3. Applying discounts: When a threshold is reached, ALL items in that stack get the discount

Example: If a customer buys:

• 2 blue T-shirts (size M)

• 3 blue T-shirts (size L)

And the discount is set to group by "product parent" with a threshold of "5 items = 10% off", then all 5 T-shirts would get 10% off since they're part of the same T-shirt family.