Believe me, I tried. The only way I can see of doing it it open Access and keep hitting Add or Insert, whichever it was, until you reach the desired number. Thing is, I want to bump it up 200 numbers.
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Ok, make a backup of the file before attempting. I did this for Judy a few years ago, and I had changed another, so I know it works.
Copy the db locally and work with that. Open with Access (I'm using 2003) and create a new query against the Orders table. Switch your view to SQL and replace any code with the code below, replacing 1999 with the number just before the one you want to be your next order number.
INSERT INTO Orders (ordID) VALUES (1999);
Run the query then open the Order table. You should find the last record ID is 1999. Go ahead and delete #1999 record and upload the db to your site but first make another copy or rename the live db.
In this example the next order that is created will be #2000.