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Populate a 2nd list box after selecting a record in the 1st listbox

SteveL13 asked
Last Modified: 2018-02-16
How can I populate a 2nd listbox on a form (multi select = Simple), with records  after selecting a record in the 1st listbox.  The 1st listbox shows categories.  When I select one of them I want the related sub-categories to display in the 2nd listbox.  How can I do this?
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