two approaches:
#1: use Pages to assemble the 4 separate documents into a single document. This might prove a bit of a chore depending on how each page document is spec'd. Once you've created the multipage document it is a simple matter to export it as a multipage PDF.
#2: export each Page document as a single page PDF and use another app to assemble the individual PDFs into a single PDF. The full Acrobat Pro can do this and I'm sure there are other tools out there that can.[/QUOThanks for the replies. If I use option 1 how can I gather all the pages as a single sheet, please?