You can do this with a data validation dropdown list and
programming. There's an example here:
http://www.contextures.com/excelfiles.html
Under Data Validation, look for 'DV0017 - Select Multiple Items from
Dropdown List'
> On an excel spreadsheet that I have, I have a column which I want
> locked so only validated data can be placed in the cells. However,
> there are multiple acceptable choices (ie column 1 could include choice
> a and choice c). Is there any way to allow for this?

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Debra Dalgleish
Contextures
http://www.contextures.com/tiptech.html