Our company currently uses Quickbooks Pro Accounting. We realized after about 1 year that our COGS was incorrect. Is there any way to change the average COGS sold so it will be reflected in all reports dating back 1 year without having to reenter all the invoices?

Thank you.

If you are using inventory to get the average cogs, you will have to change each bill/invoice with the item on it to change the average cost.