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

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?
SteveL13Asked:
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PatHartmanCommented:
This is called cascading combos and there are lots of variations on how to do it.  My preference is for the dependent combo to use a query as the rowSource with a WHERE clause that references the parent combo:

Where MyField = Forms!yourForm!ParentCombo

Then in the AfterUpdate event of ParentCombo,, you requery the dependent combo

Me.DependentCombo.Requery

So, it's one line of code plus a where clause in your RowSource query.
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