Sub Lignesplus()
Dim i&
Application.ScreenUpdating = False
For i = 1 To [A65000].End(3).Row * 2 Step 2
Rows(i).EntireRow.Insert
Rows(i + 1).Copy
Rows(i).PasteSpecial Paste:=xlPasteFormats, Operation:=xlNone, _
SkipBlanks:=False, Transpose:=False
Next i
Application.ScreenUpdating = True
End Sub