Add document

Hi

Can onyone tell me how to do following.

I have printed several woksheets from excell and want to add an external pdf file before combining all the files to one. On the net i found several codes to print from the worksheets but not to add an external file.

When creating the object the add or document add does not work. Where can i find all the existing commands for the pdfcreator, or some code to solve my problem.

I have already looked in the com section from my installation but without success

Thanks