It's hard to say with so little information. Are you saying that you have a number of digitally signed documents, and you want to combine all of the pages from each into a single document, or something else?
If you modify a signed document the signature must be invalidated - this is absolutely vital. So you cannot combine them into a single multi-page PDF and still have valid signatures.
Later versions of Acrobat support PDF portfolios, which are designed for this purpose. The PDFs remain separate in a PDF wrapper.
Yes. They were all signed but need them combined into one single document for a project we are working on. It would allow for easier printing and easier reability of the document as they ultimately need to be printed or viewed in a booklet format, for instance, with each page one after another rather than opening numerous seperate documents.