This can be used in either line or order levels promotions.
This offer type can be used to give customers a range of items at a discounted price by setting up a promotional pricelist.
E.g. Customers can be offered a range of products with different pricing
If used on a line level, the promotional price will be applied before checkout, the discount is applied to the lines of an order.
If used on an order level, the promotional price will be applied when going to the checkout and will be applied to the total price of the lines.