Apply discount only on multiples of a number?

Hi!
Ive just bought AwoCoupon, and it has a lot of possibilities, so im a bit confused.
I sell LED strings. Each Roll has 5 meters, and if the person buys a whole roll i want to apply 15% discount.
Is is possible to have an automatic coupon to do that?
If 5 meters apply 15% discount.
If 7 meters, apply 15% to the 5 meters, and charge regular price for the 2 extra meters.
If 19 meters, apply 15% discount to 15 meters, and charge regular price for the 4 extra meters.

Thanks!

Hello,

How is meter measured on your site? Is each meter a quantity? So if buying 5 meters, then they are buying a quantity of 5?

Oh, i just realized you answered me. Sorry for my delay.
Yes, in my website i consider 1m = 1pc

Ok, you could do it but not very easily. You would have to use parent coupons and value definitions. So for example, if you want to give up to 20m in discounts then you could do something like this:

Coupon A: value definition, progressive
qty value
20 15
21 0

Coupon B: value definition, progressive
qty value
15 15
16 0

Coupon C: value definition, progressive
qty value
10 15
11 0

Coupon D: value definition, progressive
qty value
5 15
6 0


Then create a parent coupon, where you combine these coupons in this order:
- Coupon A
- Coupon B
- Coupon C
- Coupon D

And then use the process type 'first found match'. Then give out or use the parent coupon in automatic discounts.