Data Card variable select list help

How can I create an object on a data card to allow for a user to select one, many or all items in a list? In my old days of MS Access (don't laugh), this was possible by the user holding the shift key when selecting multiple items in a list. But I don't see how to resolve the same issue using a Data Card in PDM. Do I just create a bunch of checkboxes? Do the checkboxes transfer to the Word form that the Card is creating?

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