Sellers have the option of placing items in their inventory on sale. Selecting a number greater than 0 will place selected items on sale. For example to put items on 10% off sale, type in 10 in the sale field. Enter 0 in the sale field to remove the sale.
Selecting a number less than 0 will increase prices of selected items by the percentage you specify. For example if you want to double your prices, enter -100.