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How to build this into Webflow

I have a client that would like to build something like this website for his online tutoring business. He likes how the form narrows down the choice of the customer. How would you do this in webflow? Custom code? Plugin?

I know how to do the cms with Finsweet but, not sure how to make the form narrow down the choice of the CMS.

Here is my public share link: LINK
(how to access public share link)