Posting to more than one Excel newsgroups wastes other
people's times, and probably your own as well. The same
people inhabit these groups, and even if that were not the
case there are a lot of people around who can answer a
question.
FWIW (For What It's Worth): practically any question that you
would ask can be answered by putting together one or more
answers from the Google Groups archives.
http://groups.google.com/advanced_group_search?q=group:*Excel*&num=100
Using a search containing your own words:
Find messages with all these words: subtraction function
