How can I relate 3 field to Wordpress post?

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I have a custom field whose name is type of vehicle. This field gets the guys car or motorcycle. I made a combo select with jQuery which, when selecting the type of vehicle, is completed with the vehicle mark. For example: tipo = moto > marca = Honda. So far so good. But when I select the tag to return the model in a third select, which is related to the model, it returns nothing!

The field for the vehicle type is a custom field. For the make, use a category, and for the model, another custom field!

There is a better way to relate these three fields?

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    Post part of code to facilitate.

  • I could try to help, but without code it’s hard to say anything...

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