merge pdf files together

Does anyone knows a smart solution in office2010 to combine excel work sheets with word files in a PDF file?
Copy-paste works for the regular sheets but the formatting is not the same in word (it tries to put the sheet into the existing word format which kills the excel sheet)
The IT guy doesn't allow installations of additional software (i suggested the open-source pdfcreator software from sourceforge).
At the moment we use online tools like exceltopdf.org & combinepdf.cc which is a painstaking process since it doesn't allow resorting individual pages.

To be more precise, we need the following things:

• -Keep the original document format
• Keep the original paper size
• Sort the documents in the PDF

The mentioned option doesn't allow placements of individual excel sheets between other pages.
Any suggestions?

Thanks!

Have you tried this? http://office.microsoft.com/en-us/word-hel…A010120810.aspx

Thank you for the suggestion, but that's just "copy-paste" technique.
Well, it works for small excel sheets to transform into a word table 

We export to PDF in Office now and we do the merging with http://online-pdf.org

Looks not very professional, but it works