Merge Pdf in Java  SDK

Hi

We have a requirement to package couple  webi and crystal reports and merge the out into PDF.  In Publications, we can have only one Kind of documents (either webi or crystal). Hence planning to write custom code to merge the reports into PDF.   Can we use MergePDF publication Extension function(with table of contents, page numbers) in my custom code? If yes, can you help to get the code?

Also, do we have possibility to export the merged reports to PPT or pptx?

Thanks

Pavani