Hi Osorio,
Wix code allows you to interact with your Wix site using Javascript.
As I understand, you wish to import some HTML code into your Wix site.
You can achieve that by embedding it in an iframe element.
see more here
For a list of guidelines and limitation of using the iframe elements please see here
If this solution does not work for you, you can also try recreating the presell page from scratch using Wix Editor and Wix code.