To clear deviated pricing you must first go to Admin Settings. This is done by clicking the Admin Settings tab at the bottom of the application.
Once you are in the Admin Settings tab click the Deviated Prices button in the ribbon at the top of the page and select Clear.
A window will appear allowing you to select the vendors for whom you wish to clear items that have deviated pricing.
Once you have made your selections click Ok to clear the deviated pricing for the items associated with the selected vendors.