Dim ligne_bas As Integer
cellule_bas = 2
Dim cellule_haut As Integer
cellule_haut = 2
For j = 2 To nbre_lignes
If Cells(j, 20) <> "" Then
cellule_haut = j
Cells(cellule_haut, 23).Formula = "=SOMME(V" & cellule_bas & ":V" & cellule_haut & ")"
cellule_bas = j + 1
cellule_haut = 0
End If
Next