When a product's inventory is tracked in Shopify, the inventory quantity that's available at a location is updated automatically when you receive a transfer that includes the product.
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From your Shopify admin, go to Products.
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Click the name of the product that you want to track.
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If the product has variants, then click the variant that you want to track.
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In the Inventory section, check Track quantity.
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If you want to allow customers to purchase the item when it's out of stock, then check to Continue selling when out of stock.
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In the Quantity section, enter the quantity information for each location.
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Click Save.
