Hi,
There is no support for footnotes or endnotes although you can use
superscript and subscript. For example if cell A1 contains Friday1, you can
select the 1 on the formula bar and choose Format, Cells, and check
Superscript or Subscript.
The may be a 3rd party add-in to help you, try Googling on something like
"Footnotes in Excel". There is a 3rd party add-in for Word which adds
additional capabiltiies for footnotes and endnotes.