Does Excel support endnotes?
 

I want to insert endnotes into my excel spreadsheet to track sources used for
each cell.

Not endnotes, but Comments.

Select the cell you want to document, then press Shift-F2 & type your notes

Cells with documentation/comments are denoted by a small red marker in the
top right portion of the cell. Hovering your mouse over one of these cells
displays the comment. To be sure the red markers are visible, select Tools |
Options from the menu and go to the View tab. Make sure the middle or right
option under 'Comments' is selected.

"Karen_Harner" wrote:

I want to insert endnotes into my excel spreadsheet to track sources used for
each cell.