If your input files have same structure, you can used indirect loading of Flat file. Please refer the below kbs for more information.
Thanks for the articals.
I cant use the Indirect file type here becouse after reading each file i need to finish complete wf before it starts reading 2nd file.
if i use indirect in S2 then it will load all the files in List file one by one and then move to S3.
But i need to run all sessions after reading each file.
i achieved this for now by using informatica scheduler options to end after 15 runs(max no of files i can receive every day)