Opencart Change to Product Page

We are in the process of building a website were we will be offering wood, we need adjustments to our website so that we can offer a volume discount to our products, just like here [login to view URL] For example: We sell a product for £49.98, we sell this product by the box. Each box has 2m2 of flooring so it would be £24.99 per M2, we need the product page to display the price per M2 as a base price but also show for a volume discount, please take a look at this page as we need it exactly like this, [login to view URL] We are using the Sellya opencart theme on our website.