Dear Friend, just go through the appended link, and you will get details about the complete P.F. procedure: [EPFO](http://epfindia.nic.in).
P.F. Registration Requirement
As per P.F. norms, if any company crosses the 20-employee mark, it is mandatory to register under the P.F. Act. Concerning your company, it has exceeded the basic number significantly. I am really wondering why your company has not opted for either P.F. registration or its own exempted trust until now. Anyway, do not delay the P.F. registration process. If you consult any P.R.O. in your area's P.F. office, you will receive all the necessary information about the registration procedure. However, be prepared for numerous inquiries from P.F. authorities regarding the late registration, especially with 600 staff members. To my knowledge, they may also impose penalty charges, so get ready to face that.
If you seek an accurate answer to your query, you will have to wait until our seniors reply.
I wish you all the best.