Multiple-step purchase

I wonder if this is possible within the enfold theme, or if it’s not – maybe you could give me a recommendation for what I’d need?

Imagine a shop page where you customize a computer, and for every change you do, you can see how it effects the total price. You click to the next page, and continue with those components.

I’d like something similar – but for animation. My clients buy videos that differ in cost depending on components (different languages, different voice-overs), and length. Often a component has a more expensive first price, but when buying more, the cost goes down. For instance, the first 30 seconds studio recorded voice over is quite expensive, but to add 30 extra seconds doesn’t cost that much extra.

All these prices are dependent on the actual length of the video, whether it’d be adding subtitles or animation.

In the end you can click a purchase button and pay for example by credit card.