Dropdown menu within a drop down menu

Hello! Is a dropdown menu within a dropdown menu possible? Something like the picture I have attached. I searched the forums on how to achieve this but to no avail also looked into Combobox but I think the widget isn’t allowed to have children. Thanks in advance for any inputs.

Look into Expandable Area widget for something somewhat straightforward. Or into Tree View widget if you’re brave enough.

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Thanks for this! The Expandable Area is what I am looking for.

Does anyone know how to add ComboBox title in the area of the ComboBox?

Combo Boxes have no titles, they can have a a default value - one hard-coded from its array:

You may need to clarify further. Perhaps you want to add another native widget, like a text block to serve as a label.