Sub Concatene()
Dim i As Integer, Valeur As String
For i = 1 To Application.CountIf(Range("A:A"), "*") Step 2 ' à adapter
Valeur = Cells(i, 1) & " " & Cells(i, 2) & "," & Cells(i + 1, 1) & " " & Cells(i + 1, 2)
Cells((i + 1) / 2, 3) = Valeur ' si rangement en colonne C
Next i
End Sub