[RSS Feed/News] Child in a submenu once parent is selected

[XenForo]

Working on tweaking a search function I have and currently struggling to have child under parent appears in different field (a second field) when parent is selected. Currently they are in the same field, either hierarchical or alphabetical.

Code:

`parent`
  `-level 1`
       `--level 2`
          `--- level 3`
            `----level 4`

so I would like to: select country (dropdown) select state (dropdown once country is selected) select city (dropdown once state is selected)

Here is the...

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