Batch edit existing orders' cost per item

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I have figured out that my cost per item for a certain product is slightly different. Thus, my Shopify analytics and reports are all miscalculating things like profits, etc. Looking back at my reports, it's because older orders are using the old cost per item, rather than the newly inputted one. How can I change them in bulk (I have 500+ orders in the 3 days my site has been live)?

Many thanks!