In the copy, let's assume the cell in which you want the comment to show is B5. Make sure there is a comment in cell B5, or this will generate an error.
Open the Visual Basic Editor: ALT+F11
Copy and paste the code provided below
Close the Visual Basic Editor: ALT+F11
Save the code (click the save tool)
Now chnage the contents of cell D5.
Is that basically what you wanted?
Far Farley The professional Network Atlanta, Georgia
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Private Sub Worksheet_Change(ByVal Target As Range)
If Range("D5").Value = "SHOW BREAKDOWN" Then Range("B5").Comment.Visible = True Else Range("B5").Comment.Visible = False End If