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)

 

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

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Set Parent Field

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Now you can assign Models to Makes

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or when you edit option

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

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and on the search forms:

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

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