SimpleCart v2 Manager Stock

Stock (or inventory) is managed per product. Via Extras > SimpleCart > Management on the Stock tab you can get an overview of the stock levels for all products.

There's also an export option to download a CSV file with all records.

The stock levels are automatically reduced whenever an order is created that includes the product.

The SimpleCart stock overview with export feature

SimpleCart does not automatically show an error when a user tries to purchase a product that is out of stock. If you'd like to show such an error, you can add that to your template based on the [[*product_stock]] resource field.