Below procedures help you place superscript into a cell if for any reason you need an embedded table in MS Office application.

Put last three characters in superscript

Sub SS_last3chars()
    Selection.NumberFormat = "@"    'Changes the cell type to text
    With ActiveCell.Characters(ActiveCell.Characters.Count - 2) 'Selects last three characters in active cell
        .Font.Superscript = True    'Changes the attribute to superscript
    End With

End Sub

Add superscripted (1)

Sub SS_1()
    Selection.NumberFormat = "@"    'Changes the cell type to text
    ActiveCell.Value = ActiveCell.Value & "(1)" 'Pastes active cell adding footnote
    With ActiveCell.Characters(ActiveCell.Characters.Count - 2) 'Selects last three characters in active cell
        .Font.Superscript = True    'Changes the attribute to superscript
    End With

End Sub

Place (x) footnote, where x is the number obtained from the user

Sub SS_UserInput()
    Dim footnote As String
    Selection.NumberFormat = "@"    'Changes the cell type to text
    footnote = InputBox("Which index number to place?", "Komar's code!", 1) 'Asks user to supply index number, default is "1"
    ActiveCell.Value = ActiveCell.Value & "(" & footnote & ")"  'Pastes active cell adding footnote elements
    With ActiveCell.Characters(ActiveCell.Characters.Count - 2) 'Selects last three characters in active cell
        .Font.Superscript = True    'Changes the attribute to superscript
    End With
End Sub

Above video depicts the use of the procedure, when video looks frozes it actually displays an input box waiting for user input. Put the number of times the text is duplicated. Windows xbox screengrab only takes the active window, sorry, for now I don’t have anything better.