We use NW SBS6.5 which includes Bordermanager 3.8. I have been told
that there is an enterprise-level web filtering add-on available for
this, but I can't seem to find any information on it. We do not
currently use BorderManager as our firewall (we have a hardware
firewall in place) but are looking into Web filtering, and would like
to use a Novell product if possible.

Can anyone steer me in the right direction?

Thanks in advance!