Untested in the absence of your workbook but something like the following in a SheetChange event macro.
First name the cell that contains the drop down. It future proofs things for when you inevitably add some rows or columns above or to the left.
Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Range("mydropdown")) Is Nothing Then
If LCase(Target) = "regular and extended" Then
Target.Cells(2, 1).EntireRow.Hidden = False
Else
Target.Cells(2, 1).EntireRow.Hidden = True
End If
End If
End Sub
Bookmarks