Offer Discounted Price along with showing the Actual price


I am looking to offer a discount for some of my themes. And I want to show both the actual price and discounted price. But i did not find the option to offer a discounted price the theme update form. There is only one field to add the price only. And then i saw this link where both actual price and discounted price is included. So i want to know how it is done.

I believe (could be wrong) that link is select files and a page owned by envato. It’s not a display feature open to all authors