How to make conditional dropdown in wordpress - javascript

i am fresher in wordpress.
i am making relation dropdown in wordpress.
i want to make dropdown when parent dropdown option selected then in child dropdown show options relate to parent dropdown options and when child dropdown of option selected then sub child dropdown open.
how can i make table of parent,child,sub-child dropdown list in database of wordpress.
i am using contact form 7 plugin but not working
that dropdown also have checkboxs can select more then one options.
[select* my-name "-- choose -- " "option1" "option2"]
what is the process to make cascading dropdown in wordpress. if any custom code or plugin in wordpress then suggest me to do this work.

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I've managed to build and insert the four dropdowns based on code from an old post I found but being the noob I am I have no idea where to insert the backend coding to make the search function properly. So where do I insert the first section of code (seen in the top answer of this old post) to make my dropdowns function dynamically?
I have tried inserting it just above the code for the dropdown boxes but this has not worked.
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Please refer - https://select2.github.io/examples.html
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