Dim xRg As Range
Dim xChangeRg As Range
Dim xDependRg As Range
Dim xDic As New Dictionary
Private Sub Worksheet_Change(ByVal Target As Range)
'Updated by Extendoffice 20221505
    Dim I As Long
    Dim xCell As Range
    Dim xDCell As Range
    Dim xHeader As String
    Dim xCommText As String
    On Error Resume Next
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    xHeader = "Previous value :"
    x = xDic.Keys
    For I = 0 To UBound(xDic.Keys)
        Set xCell = Range(xDic.Keys(I))
        Set xDCell = Cells(xCell.Row, 6)
        If (xDCell.Value = "") Then
            xDCell.Value = xDic.Items(I)
        Else
            xDCell.Value = xDCell.Value & "," & xDic.Items(I)
        End If
        
    Next
    Application.EnableEvents = True
    Application.ScreenUpdating = True
End Sub
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    Dim I, J As Long
    Dim xRgArea As Range
    Dim st As String
    On Error GoTo Label1
    xDic.RemoveAll
    If Target.Count > 1 Then Exit Sub
    Application.EnableEvents = False
    Set xDependRg = Target.Dependents
    If xDependRg Is Nothing Then GoTo Label1
    If Not xDependRg Is Nothing Then
        Set xDependRg = Intersect(xDependRg, Range("C:C"))
    End If
Label1:
    Set xRg = Intersect(Target, Range("C:C"))
    If (Not xRg Is Nothing) And (Not xDependRg Is Nothing) Then
        Set xChangeRg = Union(xRg, xDependRg)
    ElseIf (xRg Is Nothing) And (Not xDependRg Is Nothing) Then
        Set xChangeRg = xDependRg
    ElseIf (Not xRg Is Nothing) And (xDependRg Is Nothing) Then
        Set xChangeRg = xRg
    Else
        Application.EnableEvents = True
        Exit Sub
    End If
    
    For I = 1 To xChangeRg.Areas.Count
        Set xRgArea = xChangeRg.Areas(I)
        For J = 1 To xRgArea.Count
            xDic.Add xRgArea(J).Address, xRgArea(J).Formula
        Next
    Next
    Set xChangeRg = Nothing
    Set xRg = Nothing
    Set xDependRg = Nothing
    Application.EnableEvents = True
End Sub

Dim xVal As String
'Update by Extendoffice 2022/9/30
Private Sub Worksheet_Change(ByVal Target As Range)
    Static xCount As Integer
    On Error Resume Next
    Application.EnableEvents = False

    If Target.Address = Range("C2").Address Then
        If Range("C2").Value = "" Then
            Range("D2").Resize(xCount, 1).Clear
            xCount = 0
            xVal = ""
            Application.EnableEvents = True
        Exit Sub
    End If
        If xVal <> "" Then
            Range("D2").Offset(xCount, 0).Value = xVal
            xCount = xCount + 1
        End If
    Else
        If xVal <> Range("C2").Value Then
            Range("D2").Offset(xCount, 0).Value = xVal
            xCount = xCount + 1
        End If
    End If
    Application.EnableEvents = True
End Sub
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    xVal = Range("C2").Value
End Sub