Discount: 

There are several methods to get a discount.

1. Use the discount field for a frontend user and enter the percent of discount.
2. Use the price2 field for special feuser groups or other things. This setting is done in TypoScript via the IF-statement.
3. Use the discountprice calculation where the discount depends on the value of the total number of the products which have a special price. This will be available for the frontend user group 'discountGroupName'.