Cool, merci Robert, ça marche très bien sur la partie chèque mais je n'ai plus rien sur la partie "refacturation" ainsi que "sortie de caisse". 
Il me semble bien avoir changé ce qu'il fallait mais il faut croire que non. Il y a quelque chose qui m'échappe ! 
voila ce que donne le code en entier : 
Sub GW_lance_1a31()
    Dim dtDateDeb As Date
    Dim dtDateFin As Date
    Dim i As Integer, k As Integer, l As Integer, m As Integer, drapeau As Boolean
    Dim ligne1 As Long, ligne2 As Long, ligne3 As Long, ligne4 As Long, ligne5 As Long, _
        ligne6 As Long, ligne7 As Long, ligne16 As Long, ligne17 As Long, ligne18 As Long, _
        ligne19 As Long, ligne20 As Long, ligne21 As Long, ligne22 As Long, ligne23 As Long, _
        ligne24 As Long, ligne25 As Long, ligne26 As Long, ligne27 As Long, ligne28 As Long, _
        ligne29 As Long, ligne30 As Long, ligne31 As Long, ligne32 As Long, ligne33 As Long, _
        ligne34 As Long, ligne35 As Long, ligne36 As Long, ligne37 As Long, ligne38 As Long, _
        ligne39 As Long, ligne40 As Long, ligne41 As Long, ligne42 As Long, ligne43 As Long, _
        ligne44 As Long, ligne45 As Long, ligne46 As Long, ligne47 As Long, ligne48 As Long, _
        ligne49 As Long, ligne50 As Long, ligne51 As Long, ligne52 As Long, ligne53 As Long, _
        ligne54 As Long, ligne55 As Long, ligne56 As Long
    ligne1 = 56: ligne2 = 56: ligne3 = 56: ligne4 = 56: ligne5 = 56: ligne6 = 56: _
            ligne7 = 56: ligne8 = 56: ligne9 = 56: ligne10 = 56: ligne11 = 56: ligne12 = 56: _
            ligne13 = 56: ligne14 = 56: ligne15 = 56: ligne16 = 56: ligne17 = 56: ligne18 = 56: _
            ligne19 = 56: ligne20 = 56: ligne21 = 56: ligne22 = 56: ligne23 = 56: ligne24 = 56: _
            ligne25 = 56: ligne26 = 56: ligne27 = 56: ligne28 = 56: ligne29 = 56: ligne30 = 56: _
            ligne31 = 56: ligne32 = 56: ligne33 = 56: ligne34 = 56: ligne35 = 56: ligne36 = 56: _
            ligne37 = 56: ligne38 = 56: ligne39 = 56: ligne40 = 56: ligne41 = 56: ligne42 = 56: _
            ligne43 = 56: ligne44 = 56: ligne45 = 56: ligne46 = 56: ligne47 = 56: ligne48 = 56: _
            ligne49 = 56: ligne50 = 56: ligne51 = 56: ligne52 = 56: ligne53 = 56: ligne54 = 56: _
            ligne55 = 56: ligne56 = 56
    With Sheets(Sheets.Count)
        For i = 5 To 34
            ' mise en place de la recap REFACTURATION
            drapeau = False
            For J = 24 To 28
                If Sheets(i).Range("Y" & J).Value > 0 Then
                    If drapeau = False Then
                        .Range("A" & ligne2) = Sheets(i).Range("O5")
                        drapeau = True
                    End If
                    .Range("C" & ligne2) = Sheets(i).Range("B" & J)
                    .Range("G" & ligne2) = Sheets(i).Range("G" & J)
                    .Range("J" & ligne2) = Sheets(i).Range("L" & J)
                    .Range("P" & ligne2) = Sheets(i).Range("Y" & J)
                    ligne2 = ligne2 + 1
                End If
            Next J
            For J = 59 To 63
                If Sheets(i).Range("Y" & J).Value > 0 Then
                    If drapeau = False Then
                        .Range("A" & ligne2) = Sheets(i).Range("O5")
                        drapeau = True
                    End If
                    .Range("C" & ligne2) = Sheets(i).Range("B" & J)
                    .Range("G" & ligne2) = Sheets(i).Range("G" & J)
                    .Range("J" & ligne2) = Sheets(i).Range("L" & J)
                    .Range("P" & ligne2) = Sheets(i).Range("Y" & J)
                    ligne2 = ligne2 + 1
                End If
            Next J
        Next i
        ' <<<< D_but : Partie de procedure pour la periode du 01 au 31 du mois
        ' Recuperation de la date de debut et de fin de traitement
        With Worksheets("Accueil")
    dtDateDeb = Format(DateSerial(Year(.Range("C4").Value), Month(.Range("C4").Value), Day(.Range("C4").Value)), "dd/mm/yyyy")
    dtDateFin = Format(DateSerial(Year(.Range("C5").Value), Month(.Range("C5").Value), Day(.Range("C5").Value)), "dd/mm/yyyy")
End With
        ' Recuperation du montant de tous les cheques
        Call RecupererChq(dtDateDeb, dtDateFin)
        ' >>>> Fin : Partie de procedure pour la periode du 01 au 31 du mois
    End With
End Sub
Function couleur(cel As Range)
    couleur = cel.Interior.ColorIndex
End Function
Public Sub RecupererChq(dtDateDeb As Date, dtDateFin As Date)
' Recuperation de la date et du montant des chquess
    Dim lgLigChq As Long
    Dim lgColChq As Long
    Dim lgWS As Long
    Dim dtDate As Date
    Dim strJour As String
    Dim lgLig As Long
    Dim lgCol As Long
    Dim bTrouveWS As Boolean
    Dim pass As Integer
    ' Ligne d'affichage
    lgLigChq = 108   ' ö partir de la ligne 108 de la feuille "Recap"
    lgColChq = 1   ' ö partir de la colonne A de la feuille "Recap"
    ' Effacer le contenu de la plage de cellules de BT10 ö CD76
    pass = 0
    ' Boucle de la date de debut ö la date de fin
    For dtDate = dtDateDeb To dtDateFin
        strJour = Format(Day(dtDate), "00")
        bTrouveWS = False
        ' Rechercher l'existence de la feuille du jour concerne
        For lgWS = 1 To ThisWorkbook.Worksheets.Count
            If Worksheets(lgWS).Name = strJour Then
                bTrouveWS = True
                Exit For
            End If
        Next lgWS
        If bTrouveWS = True Then
            With Worksheets(strJour)
            If pass = 1 Then pass = 0: lgColChq = lgColChq + 2: sup = 0
                ' 1er bloc de chques entre les colonnes M13 et Y200
                ' Lignes de 13 ö 20
                For lgLig = 13 To 20
                    ' Colonnes de M ö V par pas de 3
                    For lgCol = 13 To 25 Step 3
                    
                        ' For lgCol = 13 To 22 Step 3
                        ' If .Range("Y" & lgLig) <> 0 And .Cells(lgLig, lgCol) <> "" Then
                        If .Cells(lgLig, lgCol) <> "" Then
                            Cells(lgLigChq, lgColChq + sup).Value = dtDate
                            'Cells(lgLigChq, lgColChq + 1).Value = .Range("Y" & lgLig).Value
                            Cells(lgLigChq, lgColChq + 2 + sup).Value = .Cells(lgLig, lgCol).Value
                            lgLigChq = lgLigChq + 1
                        End If
                        ' Les lignes ö afficher ne doivent pas d_passer la ligne 150
                        If lgLigChq > 150 Then
                            lgLigChq = 108
                            lgColChq = lgColChq + 2
                            sup = sup + 2
                            pass = pass + 1
                        End If
                    Next lgCol
                Next lgLig
               If pass = 1 Then pass = 0: lgColChq = lgColChq + 2: sup = 0
                ' 2me bloc de chques entre les cellules M48 et Y555
                ' Lignes de 48 ö 55
                For lgLig = 48 To 55
                    ' Colonnes de M ö V par pas de 3
                    ' For lgCol = 13 To 22 Step 3
                    ' If .Range("Y" & lgLig) <> 0 And .Cells(lgLig, lgCol) <> "" Then
                    For lgCol = 13 To 25 Step 3
                        If .Cells(lgLig, lgCol) <> "" Then
                            Cells(lgLigChq, lgColChq).Value = dtDate
                            ' MsgBox lgColChq & "  " & Cells(lgLigChq, lgColChq).Address
                            ' Cells(lgLigChq, lgColChq + 1).Value = .Range("Y" & lgLig).Value
                            Cells(lgLigChq, lgColChq + 2).Value = .Cells(lgLig, lgCol).Value
                            lgLigChq = lgLigChq + 1
                        End If
                        ' Les lignes ö afficher ne doivent pas d_passer la ligne 150
                        If lgLigChq > 150 Then
                            lgLigChq = 108
                            pass = pass + 1
                            lgColChq = lgColChq + 2
                          End If
                         If pass = 1 Then pass = 0: lgColChq = lgColChq + 2
                    Next lgCol
                Next lgLig
            End With
        End If
    Next dtDate
End Sub