This entirely depends on how complex your PDFs are. @malikusama95​ 

The simple way to do this would be to read in all of your PDFs with separate readers, combining them with a combination of PDFStyler and PDFPageFormatter transformers, and then writing them out to PDF with a PDF Writer.

For more information on how to deal with PDFs in FME see these resources:

• Getting Started with PDF Reading
• Reading Simple PDFs
• How to Make a 3D Globe from 2D Vector Data

Thanks for answer @Evie Lapalme​ 

i want to multiple PDF's in one booklet

i am giving you example in attachment

same name files merge in one PDF booklet.

please give me solution