جرب هذا التعديل
Private Sub Worksheet_Selectionchange(ByVal Target As Range)
For i = 9 To [A10000].End(xlUp).Row
If Cells(i, 1) <> "" Then
y = Mid(Cells(i, 1), InStr(Cells(i, 1), "/") + 1) & "/" & _
Mid(Cells(i, 1), InStr(Cells(i, 1), "/") - 2, 2)
Cells(i, 2) = y
Cells(i, 3) = Mid(Cells(i, 1), InStr(Cells(i, 1), "/") + 1)
End If
Next
End Sub