To make sure customers can still pre-order the product they desire when it is out of stock. Follow the easy steps below:
Step1. In your Shopify admin, go to Products.
Step2. Click on the product that you want to enable pre-orders on. In this example, we choose Cool Kicks.
Step3. Scroll down to the Inventory section and check the box to allow customers to purchase this product even when it's out of stock.
Step4. Click Save.
If you need help, click Contact Us below.