Enable Product Stock Management
Let’s say you have 10 pieces of the product and you don’t want to receive after orders are placed for 10 units. If you enable stock management and enter 10 in the quantity field, then after 10 units are ordered, this product will show a message that all the quantities are sold and there is no stock.
But, you might want to take some pre-orders before your next batch comes up. So you can Allow Back Order to let the customers place orders even if the product is out of stock.


