Layered Dropdown List

Hello,

I would like to ask your advice on how I can implement layered dropdown list.

Let's say I have three tables, one called Country, another called State, and the other called 'City'

And you are adding information about a particular city in admin site.

So I want to have a dropdown like thie

Canada

- BC

- Alberta

US

- California

- New York

I am not implementing about countries and states, but this kind of dropdown box is what I would like to get.

The user or admin can select only the states.

I would appreciate any input I can get.

Thank you for reading my question and I hope to hear from you.

Regards

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