How To Set up Pre-Order Product?

When a product is sold out and you choose ''Track quantity'' and ''Continue selling when out of stock'', the button will show ''Pre Order'' and customers can purchase the item.
  1. 1.
    From your Shopify admin, go to Products -> All products.
  2. 2.
    Find and choose the sold out product that you want to edit.
  3. 3.
    In the Inventory, turn on Continue selling when out of stock.