I find that using another column and putting an X (or any non-blank character)
in that cell is easiest.

Then I can apply data|filter|autofilter and see all the non-blanks or blanks.

rebeccca wrote:

I have a large database in excel. I would just like in option in one column
where if the subject applies, you can just check a box. Is this possible and
if so, how do I do it? Thanks!

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Dave Peterson