Doug,
Add a new file system to you server, call it /veritas_upgrade and shut off you old veritas, using /sbin/init.d/netbackup stop, make sure all proc's are stopped, run bpps -a. Now copy all data in /usr/openv to the new mounted "/veritas/openv file system. mv /usr/openv to /usr/openv.orig now ln -s /veritas/openv /usr/openv, now upgrade the copy.
All happy with upgrade, leave it be if not happy then relink the original copy and turn it back on.
J