When you receive PDF files from your customers, you will need to create impositions of these files. Or even center these PDF files on a sheet of paper, to optimize output, regardless if they have a bleed area or cropmarks. Your output or prepress people have to take care of all these files, to make sure they are output in the most optimal way.
Some companies use very complicated and expensive software for this task, others use InDesign to manually impose these supplied PDF files to printable files.
But now there is an alternative: PageMapper.
PageMapper will analyze the supplied PDFs, and use InDesign to create printable, optimized output, in a matter of seconds!