Reproduce a 4 level dropdown menu

Check the multiple level dropdown menu here: [login to view URL] I want to reproduce it but with only 4 level of dropdowns: MAKE then MODEL then GENERATION then ENGINE. Each dropdown will be hidden until the previous one is selected. And I don't need the checkbox, only a button that will go to a certain URL. Also, all the data I would like to be in a JSON object, so I can edit it, and near the ENGINE type, there should be a place where you can hard code (manually type) each url where the button will redirect to. Need it done ASAP. Max. budget: $20;