BUE 2012 target and initiator

Hi, I want to do a backup from drive A to drive B using Symantec BUE 2012. I am not able to find an option that tells backup from this drive to another. Please let me know how I can specify my initiator drive (drive that needs to be backed up) and a target drive (drive that stores the backed up data).

Thanks,

Vidya Suryanarayana