This option is available only for the “Taxonomy” type of field. We will show how to do it for Make and Model (e.g. BMW > M4)

Please edit field that will be child – in this example Model (taxonomy):

Now you can assign Models to Makes

or when you edit option

This way you connect Makes and Models and it will works like this on your Front-end Panel Submit Listing Page

and on the search forms:

Please consider on all search forms you can disable Child Field until Parent Field is selected e.g.