Two locations with stock is two piles, not one number.

Shopify Inventory export with a Location column. We group by SKU and list those with quantity above zero at two or more locations. A SKU that only lives in one warehouse is skipped. WooCommerce Products → Export has no Location column. The file stays in this tab.

Inventory CSV (keep SKU, Location, and On hand)
Choose inventory CSV No file chosen

Or paste a table from Google Sheets / Excel. Nothing is uploaded.

Units already on order: incoming stock. Units spoken for: committed stock. WooCommerce has no Location column on the products export.

SKU	Name	Locations	On hand	Issue

What this is not

Not a transfer app. We do not move stock between warehouses.
Not a missing-image catalog check. That is csv-check.html.
Not a Shopify app. Export the Inventory CSV yourself.