Sub Encadrement()
    Dim ws As Worksheet
    Dim rng As Range
    Dim b As Borders
    
    '--- Feuille cible
    Set ws = ThisWorkbook.Worksheets(ActiveSheet.Name)
    
    '--- Dernière ligne utilisée
    lastRow = ws.Cells(ws.Rows.Count, "A").End(xlUp).Row
    
    '--- Dernière colonne utilisée
    lastCol = ws.Cells(1, ws.Columns.Count).End(xlToLeft).Column
    
    '--- Plage bornée
    Set rng = ws.Range(ws.Cells(2, 9), ws.Cells(lastRow, lastCol))   ' 9 = colonne I
    
    '--- Test visuel
    'rng.Select
    
    '--- Bordures de la plage
    Set b = rng.Borders
    
    '--- Étape 1 : supprimer toutes les bordures
    b(xlDiagonalDown).LineStyle = xlNone
    b(xlDiagonalUp).LineStyle = xlNone
    b(xlEdgeLeft).LineStyle = xlNone
    b(xlEdgeTop).LineStyle = xlNone
    b(xlEdgeBottom).LineStyle = xlNone
    b(xlEdgeRight).LineStyle = xlNone
    b(xlInsideVertical).LineStyle = xlNone
    b(xlInsideHorizontal).LineStyle = xlNone
    
'--- Étape 1 : Recréer des bordures autour de chaque cellule
    With b
        .LineStyle = xlContinuous
        .Weight = xlThin
        .ColorIndex = xlAutomatic
    End With
    
''--- Étape 2 : ajouter uniquement celles que tu veux
'    With b(xlEdgeLeft)
'        .LineStyle = xlContinuous
'        .Weight = xlThin
'        .ColorIndex = xlAutomatic
'    End With
'
'    With b(xlEdgeTop)
'        .LineStyle = xlContinuous
'        .Weight = xlThin
'        .ColorIndex = xlAutomatic
'    End With
'
'    With b(xlEdgeBottom)
'        .LineStyle = xlContinuous
'        .Weight = xlThin
'        .ColorIndex = xlAutomatic
'    End With
'
'    With b(xlEdgeRight)
'        .LineStyle = xlContinuous
'        .Weight = xlThin
'        .ColorIndex = xlAutomatic
'    End With
End Sub