A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Excel does not do "footnotes" so I assume you mean "footer" as in headers and footers when printing.
You can reference the value in a cell if you use VBA
Sub CellInFooter()
With ActiveSheet
.PageSetup.CenterFooter = .Range("A1").Value
End With
End Sub
On second thought you can enter text in a Comment then have the Comment print at bottom of page.
I guess that could be considered as footnote.
Gord