Dear tapasdutta,
To make PF returns, the process is carried out once a year, from March 2008 to February 2009, for example. The necessary documents required for PF return are as follows:
1) Individual 3A's
2) Yearly 6A
3) Monthly Challans of that specific year
Please ensure you have these documents in order for the PF return process. If you need further assistance, feel free to reach out.
Thank you.