We have a similar situation. I need to adjust the price of approximately 10,000 inventory items but they are not all the same price so the copy/paste function will not work.  Additionally, they are not all changing by the same percentage so I cannot do an adjustment by class. I have all the data in an Excel file but if I copy and paste the data into QB it will override all of the current data and I will lose all of my quantities on hand, quantities on order, and WIP information.  Please advise.  Thank you in advance.