How to update Product Inventory
On the Catalog->Manage Products page, use the filters in the product table to find your product.
Find your product
Open the product and Select the Inventory tab on the left.
If you have Managed Stock Selected - update the inventory level.
Product Inventory Tab
If product is in stock, make sure it's status is In Stock (if managed stock is selected this will change to Out of Stock if inventory becomes 0).
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