Grouped discounts by nth number

[jay]

Is it possible to make this type of coupon?:
For every 3 of an item category, give them 15% off on all matching items.
so for 4th, 5th item, the 15% discount is not applied to them, but 6th item, get 15% off on the 4,5,6 item, and so on.

EDIT: While trying to figure this out there is an additional question.
When trying to match only the 3 items to apply the discount, I set the minimum quantity needed to 3, but also the maximum to 3, so it would not apply to the 4th item. However when adding the 4th item, the coupon no longer applies. How do I change this behaviour so it will only apply to the 3 items minimum and nothing more?

[Soft79]

If you set minimum quantity to 3, then the 3rd, 6th, 9th etc… items will receive 15% off. No need to set max quantity.

To make this work grouped by category, customization is needed. The fact that a product can have multiple categories makes this more complex.

[Soft79]

I misread the question. To get discount for every group of 3 items customization is needed.

[Author]

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