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2

If they can only select one, I would go with a treeview type control, primarily because this allows you to display the top-level options, that they must select and not overload the user with sub-options they can't select, once the user has made their top-level select, I would then show those to the user. For example:


1

A hierarchy relationship is more related to what you are trying to achieve. Without any further information.


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