CentOS - Nov 2008 - adding perl modules

I have some pm files I want to add, these seem to be custom modules delivered
with a package I am trying to install. I don't want to run its script as it
manually installs many modules available in base so I will simply yum those
in. How can I add the pm files, I assume I have to update something in Perl
so that it knows these are available wherever I put them?

Thanks!
jlc