Use the inventory.xsd schema file to import or export inventory lists.
Granularity: selected inventory lists.
Products and Catalogs > Import & Export.
For development purposes, inventory lists are included in the site import process. This lets you export a site and then import it on another instance without losing any inventory-related information. When you export an Inventory file, it's first sorted in ascending alphabetical order based on productID.
ImportInventoryLists
ExportInventoryLists