[How To] Link two dropdown menus?

Hello all,

I’m trying to link the values between two dropdown menus, as shown here:

https://i.imgur.com/AVa61R9.png

When I select a value in (1), I need (2) to show different values. Unfortunately, I can’t find my way around the plugin settings.

This is what I’m looking at in the Admin panel: https://i.imgur.com/AkC7W5e.png

Can anybody help me?

https://ww.wp.xz.cn/plugins/ez-form-calculator/