A Pricing Rule defines the rules on how you charge for a specific auction. Each Auction can be defined by Pricing Rules associated with it, as the Pricing Rule contains information regarding the start bidding price, reserve price, buy now price, etc..
Once you create an Auction, you can manage Auction Pricing Rules.
Navigate to the auction you want to edit from omniAuctions \ Manage Auctions \ Auctions, select Edit next the product from the drop down option menu.
Select Pricing Rules section.
Click ? help sign next to each field to learn more.
