Paul,
Can be done with worksheet event VBA code
Here's an example that tests for Y in A1:A100
Private Sub Worksheet_Change(ByVal Target As Range)
Application.EnableEvents = False
On Error GoTo ws_exit
If Not Intersect(Target, Range("A1:A100")) Is Nothing Then
If Target.Value = "Y" Then
Target.EntireRow.Hidden = True
End If
End If
ws_exit:
Application.EnableEvents = True
End Sub
As worksheet cod, it goes in the appropriate worksheet code mosule.
--
HTH
Bob Phillips
... looking out across Poole Harbour to the Purbecks
(remove nothere from the email address if mailing direct)