Special dropdown menu - multiselector

because a picture is worth a thousand words (and because I don’t speak English very well) - Do you know if we can achieve this type of drop-down menu and, if so, how?

I am thinking of 3 drop down menus in a form but I don’t know how to categorize the database and put which data in which collection and use which relation between collections :smiley:

Thanks all for your help

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