You can easily configure pre-orders as well as product stock after downloading the Globo Pre Order app, including whether or not certain products are sold out on your Shopify store. Simply choose a product and turn on the pre-order feature.
On the Product page as well as the Collection page, the standard "Add to cart" box will be changed to a "Pre-Order" one.
Your consumers will be taken to a regular order site when they click the "Pre-Order" button. Even when the product is out of stock, you can still sell it.
Additionally, the app's countdown timer lets you specify the day and hour that your purchases will be in stock. Whenever the countdown timer expires, your stock will be immediately adjusted.