Rman Duplicate Question

Hello All:

I am in process of RMAN duplicate from production TWO RAC to SINGLE Instance database.  I restore the production database rman backup files on TEST system.

In our production environment the datafiles are created in three ASM DISK GROUP "+DATA", "+DATA2" "+DATA4" and in out TEST environment we have four mount point "u02", "u04", "u05", "u06", "u08"..

Now my question is how do I map DB_FILE_name_CONVERT parameter from PRODUCTION to TEST, since we have multiple mount point on our TEST system.  My question is how do I map three production DISK group to five mounts point in TEST.