Hi Jean, We cannot calculate the delivery fee based on the size selected since we do not have the option to calculate the order quantity by size. You can calculate the delivery fee based on order quantity, order amount, total weight, a predefined list of delivery zones only or charge a fixed amount per order (instructions below). Calculate delivery fee In the Edit page, click on the Add price field button > select Delivery fee, click Next > select Fixed amount, click Next > Enter the fee and click Create. Calculate total amount In the Edit page, click on the Add price field button > select Net amount, click Next > select Standard calculation using NETTOTAL() formula, click Next > click Create.

Hi Jean, you have created a single page form. Users can add the products, scroll down to enter the contact details, review the summary and submit the form. If you have multiple page form with the products in the first page and the contact details, summary in the second page, then you can configure the second page as the checkout page. Configure checkout page https://neartail.com/order-form/configure-checkout-page.html