You code looks OK, though:
• you haven't declared your 'FormNumber' variable;
• "Order" should read "FormNumber";
• your code inserts the form number before the bookmark, rather than updating it, which means any cross-references to the bookmark also won't update to reflect the form number; and
• you may encounter permissions issues trying to write to C:\
For a different approach, see:
https://www.msofficeforums.com/word/...iple-docs.html