Is it possible to use either TAdvPDFLib or TTMSFNCPDFLib to create a new PDF as a blank document, and then add 2 or more existing PDF's to it, resulting in a new PDF that consists of the merged, existing PDF's?
In other words,
Create PDF
Add Existing PDF1
Add Existing PDF2
Add Existing PDF3
Save new PDF - "Merged PDF"
TTMSFNCPDFLib aims for generation of PDF files only, merging PDF files is a very complex feature. Right now, it's not something we plan for the near future, but we'll definitely keep doors open. If there is sufficient interest and merging of PDF files is technically feasible we can investigate possibilities.