Discount based on first item

It would be quite useful to be able to have a discount amount per product/line and base this of the first item in the product group.

service 1 - 12 months
service 1 - 24 months (automatic 5% discount based upon the price of 12 months)
service 1 - 36 months (automatic 10% discount based upon the price of 12 months)

That saved us alot of calculation work (and possible human error). since we are now doing this manually.

Consolidated into: Add discount percentage