Is there a way to include additional information in the file name which is not a parameter on the report?
Yes. Make one more parameter in the report and make the last one. Give your parameter a name and unmark the option “Pass this parameter” on the parameter options window. Now this information can be used to create the output filename.
Example: If you are printing an Invoice where the SOP number is setup as the only parameter and you would like to include the Customer Name in the filename. Create a parameter called the Customer Name and unmark the “Pass this parameter”. When creating the parameter you can also attach a lookup to make it quick for the end user to pull in the parameter values. Now when creating the output file name you can include the customer name.