Data-->Validation, Input message. See this article for complete instructions
http://www.officearticles.com/excel/drop-down_using_data_validation_in_microsoft
_excel.htm

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~Anne Troy
www.OfficeArticles.com
> I have created drop down pick lists in excel sheets, and would like to be
> able to hover over the selections and display comments/definations for each
> pick list selection.