Populate CF7 Field with other CF7 Fields in the same Form

Hello, this might be something very simple that I’m just missing. But I believe this is a common function in most forms, well at least Ninja Forms, that I know of. But it’s where you can have say a hidden field and then take field a and field b and make the hidden field = field a + ” ” + field b, or something like that. I was wondering if I was able to do that with this plugin? I was inspired by the My Custom Fields section but haven’t seemed to be able to get it to work as of yet.