In odoo Reordering rule make sure that the product never runs out of stock by maintaining a minimum quantity.
Using this rule we can replenish the stock when it reaches a minimum stock level.
Go to Products - Open the configuration page of a storable product:
First, make sure that a vendor is set for the product after that reordering rules can be created for the product by clicking on Reordering Rules. Click CREATE button to create a new rule by giving values for the following fields: