This module is the group by the delivery orders based on the delivery date on the website. When you add the product into the cart, the sale order is created. When you add the delivery date in the product it generates the delivery order. If two product delivery date is the same then it generates a single delivery order for that But it auto-generates different delivery orders if delivery order date is different. All changes are automatically saved in the backend. If you change the product quantity and date in the backend then it automatically saved in the frontend.