Good Cloning Doc steps 12.2x

http://ermanarslan.blogspot.in/2014/07/ebs-122-cloning-real-life-example.html

　

　

R12 - Cloning from an RMAN backup using duplicate database

http://newappsdba.blogspot.in/2009/06/r12-cloning-from-rman-backup-using.html

　

3.

duplicate database and post cloned steps mentioned.

https://mustakdba.wordpress.com/2016/02/22/clone-on-ebs-12-2-4-or-12-2-0/