I am moving my library (L180) to a new server and at the same time, Netbackup
is upgraded. I know I have to move or import catalog but I did not find
related documentation on the operation.

Server goes from RedHat Linux 7.3 to RHEL 4
Netbackup goes from 4.5 GA to 5.0 GA

I found DocID 230047 that explains a part of the solution but I am not sure
of what I am doing since I am not a netbackup expert.

Can you point me to any relevant doc?