Probably a very easy question, but I need help.

If I have a very large spreadsheet containing 2000+ customer names and I
would like to create a search template (once) that can search that
spreadsheet (or workbook) with for only a set of customer names - say 15
different names - how do I do that?

Also, how could I save that search crtieria for the next spreadsheet that I
need to search?