Thread: Sub fields based on what was chosen in a primary field?

Sub fields based on what was chosen in a primary field?

I can't seem to figure out how to do this, but how can you create a custom sub field that shows up depending on what a user chose in another field?

For instance:

Country: USA/Canada (Canada is chosen) => drop down box showing only Canadian provinces appears (or vice-versa with states if the US is chosen)

or:

Car: Honda => drop down box showing only Honda models appears

I'm really hoping this is possible, or else I don't even think I'd be able to use Classipress at all.