Split product form into different steps

[VLMontoro]

Hello community! 

I would like to ask if anybody has an idea of how to create a product form (or cart) divided into steps for a customer to select:

1st. product variant

2nd. accessories

3rd. services

Something like this page has: https://cowboy.com/cart#bike

Does anybody know if there is an app able to make such customisation?

Thanks for any answer or guidance.

[AbdullahWanders]

Looks like a custom theme based on Builtwith.com

I'd love to know if there's an alternative way to do it.