How to duplicate specific backup by Using SLP(storage life cycle policy)

HI,

I have Oracle backups being taken to Data Domain by using Netbackup 7.0.1. Now i am trying to duplicate the backups from one Data Domain to another Data Domain by using SLP. i have a requirement to duplicate only last successful backup from a server(not all the backups). Can anyone help how to choose a specific backup to duplicate by using SLP?