You can delete business prices and quantity discounts:
Click on the Business Price you want to delete. This will open the pop-up window for your Business Price. Clear the value in the price field by using backspace or Delete.
Click on the Business Price you want to delete. Clear the value in the price field by using backspace or Delete.
You can use Price.xsd or create your own. Price.xsd contains a Pricing Action tag available at the SKU level to delete both the business price and the quantity discounts previously set for a SKU. This tag is optional.
For more information, see Manage Listings with XML.