[Users] How to add nested (tree inside trees inside trees up to 5th level) trees in the array

[Shariful Islam]

Thanks, Alexandre Dubé and all responded quickly to me a noob.

But I need building tree within tree (upto 5th level)example can be http://map.rostmuseum.ru/ where one check box parents several children (parent for sub.
Would u be kind to guide how to to do this (may be array but i am completely busted to do after a week i do not find where the error is).

Thanks is in advance.

Awaiting your response.
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