@Alex K You can "reset" costs by moving inventory on hand to 0 via inventory adjustment letting a full calendar day elapse (between transaction dates, not between entry in netsuite) then performing another inventory adjustment back in. There must be no inventory impacting transactions between the two dates for this to work. This may result in a "Cost of Sales Adjustment" depending on how inventory is relieved and carried out. You will have a "gain" or "loss" depending on the value difference between what you upload and what it was before. This will post to the adjustment account you select in the inventory adjustment transactions.