falcp, A simple way would be to use something like this, you could assign it
to a button, an open or before print event.
Sheets("Sheet1").Range("A1").Value = _
Sheets("Sheet1").Range("A1").Value + 1

For other ways to do this or if this is going to be used in a temple have a
look here
http://www.mcgimpsey.com/excel/udfs/sequentialnums.html


--
Paul B
Always backup your data before trying something new
Please post any response to the newsgroups so others can benefit from it
Feedback on answers is always appreciated!
Using Excel 2002 & 2003

"falcp" wrote in message
...
With Excel, is it possible to generate automatically a sequence of number
that would increse by one (1) each time the file is used? As an example
generate a new invoice number increasing by one (1) for each new invoice.
If
so, how is it done? Thank you for your help.
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Merci et bonjour
falcp