Updating old Inventory Quantities and Prices while Keeping old history

I need to add to my old Inventory identical items, but with new purchase and sale Prices!! And, Need to add new Items! How to do that please? I have650 Items

Your question is very timely. A new Guide was just posted:

You can change prices without affecting old entries. Only future ones will be affected. See the Updating portion of the Guide near the bottom. Batch operations are covered in this Guide:

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