Combining PDF files can be done easily if you have the full version of Adobe Acrobat. If you don't have the full version, you can download a free pdf creator that also combines pdf files. Cnet.com recommends PrimoPDF.
Below are the instructions on how to combine multiple pdf files into one pdf file for uploading into our online grant application.
To merge two docs/pdfs/etc., print the first to a new pdf using Primo. Close it, then print the second and save it as the SAME name as the first pdf. Primo gives you the option to 'append' or 'overwrite' the original file. By using 'append', you are just adding it to the back of the existing file. You can do this repeatedly to resort or combine existing pages into a new pdf.