会社のパワポのひな形に入っているマクロ
たまにマクロが消えていたりするのでバックアップとしてメモ

Const DEFAULT_DIVIDER As String = "/"  '仕切り文字
Const SCALEDOWN_RATE As Single = 0.6   'x/Ｙの Ｙ文字大きさ

Sub 総スライド挿入()
    Dim sld As Slide
    Dim shp As Shape
        
    For Each sld In ActivePresentation.Slides
        sld.DisplayMasterShapes = True
      
        For Each shp In sld.Shapes
            If Left(shp.Name, 12) = "Slide Number" Then
                Set TextRange = shp.TextFrame.TextRange
                TextRange.Text = sld.SlideNumber & DEFAULT_DIVIDER & ActivePresentation.Slides.Count
                
                Set charactersRange = TextRange.Characters(InStr(TextRange, DEFAULT_DIVIDER), TextRange.Characters.Count)
                charactersRange.Font.Bold = False
                charactersRange.Font.Size = TextRange.Font.Size * SCALEDOWN_RATE
            End If
        Next
    Next
End Sub