Option Explicit
Sub Recopie_doublon()
Dim Cel As Range
Dim J As Long
Application.ScreenUpdating = False
With Sheets("Feuil1")
For J = 2 To Range("F" & Rows.Count).End(xlUp).Row
Set Cel = .Columns("F").Find(what:=Range("F" & J), LookIn:=xlValues, lookat:=xlWhole)
If Not Cel Is Nothing Then
Range("A" & J).Copy Cel.End(xlToRight).Offset(0, 1)
Range("I" & J).Copy Cel.End(xlToRight).Offset(0, 1)
End If
Next J
End With
Application.ScreenUpdating = True
Sheets("Feuil1").Activate
End Sub