Opencart Pre-Order -- 2

The website will have 2 pricing per product: 1. Normal Price – The process will follow standard e-Commerce checkout 2. Pre Order Price – When user choose “Pre-Order” button to checkout, it will pop-up a calendar for user to choose the available delivery date and time. After choose it will go to normal process checkout. The selected date will display on the Order page I need the product allow admin to set 2 pricing, normal price & pre-order price. On top of that, a custom delivery module for admin to set the date & time available for delivery. For detail please check the attached document.