List of locations where you can find and set up discounts
1) Basic settings >>Items >>Price groups >> Add/amend existing discounts. This area allows you to set up discounts per item quality but not on the overall order.
2) For frontend: Basic settings >>Frontend >>Discounts/surcharges.
Surcharge on payment methods field: Item number for payment type surcharges. (note changes to the template can cause problems. The template need to be tweaked if changes to the value are made)
Order number for deduction disptach rule field: Item number for shipping rule discount shown in the basket.
Order number for all-inclusive surcharges on payment methods designated as: Item number for absolute payment methods surcharges.
3) Basic settings >> Items >> Other VAT rates. Allows to set tax rates for vouchers, coupons and discounts in general. Note, it's mandatory to have values for VAT vouchers & discounts - cannot be left blank.
4) Items >> item details >> Prices section >> Percent discount Setting discounts at product level