Is it possible (and if yes, how

What I mean is like in Acrobat Pro (6) can be done by adding a background from Document->Add Watermark/background.
What I want to do is: create one pdf-file that contains the company-layout from my customer(such as logo, address-information and so on). After generating pdf's from our software I'd like to merge them.
Hope you can help (as always

Bert