Private Sub Worksheet_Change(ByVal Target As Range)
Columns("A:C").Copy Destination:=Sheets("Feuil1").Range("A1")
Sheets("Feuil1").Cells.Font.Size = 12
Columns("D:F").Copy Destination:=Sheets("Feuil2").Range("D1")
Sheets("Feuil2").Cells.Font.Size = 12
Columns("G:I").Copy Destination:=Sheets("Feuil3").Range("G1")
Sheets("Feuil3").Cells.Font.Size = 12
End Sub