No, it's not advisable to allow pre-orders without generating a new Shopify order. Generating an order ensures accurate tracking of inventory, helps manage customer expectations, and facilitates smoother fulfillment processes. Without creating an order, there's a risk of overselling products, leading to dissatisfaction among customers and operational challenges for the business.

For more information on managing orders and pre-orders effectively, you can refer to Shopify's guide on order flow: https://help.shopify.com/en/manual/orders/flow