You can't insert a comment on multiple sheets simultaneously.

You could copy the cell that contains the comment

Then switch to another sheet, and choose EditPaste Special
Select Comment, click OK

Select the next sheet, select a cell, and press the F4 key
Repeat this last step for all remaining sheets

Or, you could create a macro to copy and paste a comment.

jen_l_333 wrote:
Does anyone know how to copy a cell's comment to several active sheets within
a workbook all at once? For instance, you can make several of the sheets
active within a workbook, alter a number in a cell, and the number will
change on all sheets in the same cell at once. Can this be done with
comments? I have only been able to do it from one sheet to another and not
with multiple sheets at once. Any help would be appreciated.


--
Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html