Someone here recommended to me "pdftk" and it will do what you asking for

http://www.accesspdf.com/pdftk/





<Jim_Neufeld@adobeforums.com> wrote in message news:59b5e947.-1@webcrossing.la2eafNXanI...
> Folks: I have a couple of dozen existing PDF files that I would like to combine into one file, is there an easy and
> automated way to do this? I will be using these same files on an ongoing basis, so occupationally I will need to be
> able to re-combine those same files. Is there a way to do this in Acrobat Pro 8? Thanks