Sub sub menu ?

[RenaudILTIS]

Sub sub menu ?

[Joduai]

afaik default functionality doesn't support 3rd lvl menu nesting.

Although I think it could be possible using menu editor, adding certain classes to elements, and using menu($custom = true) funct along with creating ul>li lists depending on item classes.

Long time ago I was wondering if it could be possible to nest elements with a flat ul list, but the only idea I could come up was incorporating jscript/jq. You can check this fiddle to get the overall idea of dropdown using 1 flat ul
https://jsfiddle.net/ry6mn8er/1/