Catalog > Maintenance > Publish Inventory to Catalog
The Publish Inventory to a Catalog allows you to selected catalog to load all inventory items to. The selected catalog will show all inventory item under one "General" category.
Process
Select an existing catalog that you would like to import all inventory items to.
To add a new inventory item to the catalog, just re-select the catalog and click process, the new item will now appear on the catalog.