I couldn't remember off the top of my head how to do this but I found the
solution at:
http://www.tech-recipes.com/microsoft_office_tips518.html
here is what it says:
"Create your table with an AutoNumber type field, but don't enter any
records. Then create another table with only a single Long Integer Number
type field. This field must have same name as the AutoNumber field in the
first table. Enter one record in the second table that is a number one less
than the required start of the AutoNumber for the first table.
Now create an append query to append the record in the second table to the
first table and run the query. You can now delete the second table and begin
entering your data into the first table."
I tried this and it works.
Keep in mind though that a lot of people use AutoNumbers for the wrong
thing. If you delete a record you are going to loose that number unless you
go through the trouble of moving all the data to another table and
re-numbering again. "Generally speaking" autonumbers should be used as
Random Numbers when you don't care what the number is as long as it's
unique.
--Steve Huff