One neat thing about PDF is its ability to represent content from disparate sources, such as images, formatted text content, spreadsheets and graphs -- and that's not even mentioning the multimedia or 3D options. In fact, it's a simple matter to combine a collection of PDFs or other files into a single, self-contained PDF.
Select File > Create PDF > From Multiple Files.
Browse (Windows) or Choose (Mac OS) to select the first file to be converted.
When you have chosen all your files and placed them in correct sequence, click OK.
Name and save the consolidated PDF by selecting File > Save As.
Alternatively, select the files you want to convert, right-click any individual file and select 'Combine in Adobe Acrobat...'.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.