Option Explicit
Sub CopyVal()
Dim F_Source As Worksheet
Dim Target As Range, Zone As Range, ShortName As String, In_Box
   
    Set F_Source = ThisWorkbook.Worksheets("Feuil1") ' <-- Classeur A
  
    With Application.FileDialog(msoFileDialogFilePicker)
        .AllowMultiSelect = False
        .Title = "Sélection du Classeur Cible"
        .InitialFileName = ThisWorkbook.Path & "\"
        .Filters.Clear: .Filters.Add "Classeur Excel", "*.xls*"
        If .Show Then
            In_Box = InputBox("Indiquez la Cellule Cible" & vbLf & "du classeur à ouvrir", .SelectedItems(1), "H63")
            If In_Box <> "" Then
                ShortName = Mid(.SelectedItems(1), InStrRev(.SelectedItems(1), "\") + 1)
                On Error Resume Next
                    If Workbooks(ShortName) Is Nothing Then Workbooks.Open .SelectedItems(1)
                On Error GoTo 0
                Set Target = Workbooks(ShortName).Worksheets("Feuil1").Range(In_Box) ' <-- Classeur B
                For Each Zone In Union(F_Source.[P63:P74], F_Source.[P79:P90], F_Source.[P94:P105]).Areas
                    Target.Resize(Zone.Rows.Count).Select ' pour vérifier ce qui est ciblé, peut être enlevé
                    Target.Resize(Zone.Rows.Count).Value = Zone.Value
                    Set Target = Target.Offset(Zone.Rows.Count + 4)
                Next
            End If
        End If
    End With
   
End Sub