Inventory CSV Import

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I have a large product list (40k) that I have to filter down from my client's P.O.S in order to update the inventory list (15k).  It's done manually at the moment and I'm unable to update the Image URL's for each time I go through this process. I need it to only update the inventory for the  current store products. Is there a way to update the inventory using the unfiltered list so that it only updates the existing items already on the store. I don't need it to add any additional products to the storefront.