Picking up multiple files from location and putting it to another location with additional logic

Hi!

I have a requirement where I need to pick multiple files from one location and put that files to another location. In source folder there is a set of file pairs - xxx.txt and xxx.pdf. In target folder I need to get all .pdf files from source folder and one .txt file containing the accumulated contents of all source .txt files.

What is the best way to implement this scenario in PI?

Regards, Evgeniy.