Try Debra Dalgleish's sample file at:
http://www.contextures.com/excelfiles.html

Under Data Validation,
look for: DV0017 - Select Multiple Items from Dropdown List
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Max
Singapore
http://savefile.com/projects/236895
xdemechanik
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"Multiselect in cell validations" wrote:
I need to a cell validation that supports multiselect. I like the concept of
the validation feature which exists in excel but need to have multiselect
capabilities. I would like this to validation to occur in each cell within a
column like you can with validation. Can someone provide me with
instructions on how to implement this?