You can upload Rational Publishing Engine (RPE) templates which in turn can call up Word templates for part (but not all) of the document content. DOORS NG comes with some RPE templates built in and you could change the Word part of these templates without having to have RPE - but the changes would be cosmetic (like changing the front cover logo and font sizes) not actual content changes. If this is what you want to do let me know and I can point you in the right direction.

However you cannot, as far as I am aware, upload pure Word templates and I am not aware of any form of PDF template.

The relevant 5.0.2 manual pages start at:  Reporting Manual but these describe all forms of reporting and don't make it clear (in my opinion). If you want to start creating RPE templates you need RPE itself (separate license) and then these pages may help: Reporting Wiki

Ali