Sub ajout_ligne()
Dim c As Range
For Each c In Range("Debut1,Debut2,Debut3")
With c.CurrentRegion.Resize(, 4)
.Rows(.Rows.Count + 1).Insert xlDown
.Rows(.Rows.Count).AutoFill .Rows(.Rows.Count).Resize(2)
Intersect(.Rows(.Rows.Count + 1), [B:C]) = ""
End With
Next
End Sub