How to make a dropdown inside a dropdown?

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1

I am wondering how can I add codes to velo such that it will achieve the result of something like the 2-layer classification system in seek?

A video is attached for illustration.

2

Hi Chapman,
To achieve this you will need to use a custom element,

Here is a small example.

Kind regards,
Kristof.

3 
Many thanks! That cleared my mind very well!