1/ Automatic discount applied by player or member categories
From PrimaShop > Settings and structures > Aisles > choose the aisle > Auto Discount > Enter the percentage for each category. A restart of your PrimaCaisse will be necessary for this setting to take effect.
The discount will be applied directly when the product is sold (provided that the sale is indeed nominative). Discounted lines will appear in red with a discount rate displayed at the bottom of the page.