If you drag a PDF to the Win2PDF Desktop icon, or select a PDF from the open window when launching the Win2PDF Desktop application, the following options will be displayed under the "Pages" menu:
Win2PDF Desktop - Append to an Existing PDF
To append (add to the end of the existing PDF), choose "Append to Existing PDF" and click "Continue". A file open Window will be displayed allowing you to select the existing PDF to append to.
This is also available using the APPEND command line.
This feature requires a licensed version of Win2PDF. Contact firstname.lastname@example.org for a time limited evaluation license.