If you're trying to bulk upload your product costs or product groupings and you're trying to add a full list of all your SKUs (even those not yet present in the Link My Books product list) then use this help document to turn on the setting to allow you to upload new SKUs.
This way we'll save them to your product list in Link My Books in advance of detecting them in reports from the sales channel.
Navigate to Inventory > Product Costs or Product Groups > Settings
Toggle on the Allow SKU Creation toggle
Save Settings
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