Hi Watermarks ,
Welcome to this Microsoft Project newsgroup
Simple answer is that you can't. However, you could put a company logo in a
header or footer. Or, create your watermark in Word and preprint pages,
then overprint with your project.
FAQs, companion products and other useful Project information can be seen at
this web address:
http://project.mvps.org/faqs.htm
Hope this helps - please let us know how you get on
Mike Glen
MS Project MVP
See
http://tinyurl.com/2xbhc for Project Tutorials