How to delete vendor contract costs on Sage 300 Purchase Orders Steps: Open Purchase Orders > P/O Setup > Vendor Contract Costs.Choose to delete costs by vendor number or item number.Enter or select the number of the vendor or item that you want to delete.Click (select) the line containing the costs that you want to delete.Note: Double-click the line to review cost details before deleting.Click Delete.Click Yes if you are asked to confirm the deletion. Sage 300 Request Support