How to pull 2-part logic from search box input?

How to create this 2-part logic from workflow of a dropdown search input?

I reckon this is a combination of RG’s (carrier), dependent RG’s (plan), backend workflows and custom states for displays. Creating each independently is fine, but combining the initiatialization by clicking/touching the display of the searchbox to the other steps, not sure how to execute.

Explore the event “when input value changes”