Are there any guidance to set up an expandable dropdown menu?

Here is the link: Dropdown menu within a drop down menu

The picture in the link is pretty similar to what I want. I tried Expandable Area and Tree View but none of them worked I was told Widget can’t have children. So how should I achieve the expandable dropdown menu?

Expandable areas are supposed host entire user widgets which can also host additional expandable areas:

You build them in modular fashion. Each of those entries have its own Expandable Area with a Header and a Body. Their entries have their own Expandable Area with a Header and a Body… and so on.

You can expose variables on those entries to edit their data here in the parent. Or edit each entry separately, or even feed it dynamic data.

There is no limit how many layers there are.

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