Add in a prestashop site some data in product, cart and categories pages

For our site [login to view URL] we need to add: a) In categories page like [login to view URL] b) In products page like: [login to view URL] c) In intermedium order page (when product is added to cart) some data: - Now it shows the price, but for the products that we setup a cart discount (like above product), the discount it is only shown at the end of the order process. We need to show the final price that the product WILL HAVE in the cart in 3 places: 1) Category pages 2) Product pages 3) Order process (after click in add to cart) Format of the data: As in attached file: put the product page, then below a dotted red square with a cart in red color like in image, then a text "Al añadir al carrito", ">>>" and the final price. Sample of desired format: [login to view URL]