Hi Robert,
I started to write you an e-mail on how to navigate through SAP Help Portal's menu structure and got lost myself. That is saying a lot since I write documentation for the Help Portal, but for SAP NetWeaver and not SAP Business Suite.
Help Portal's search has improved quite a bit over the years. So I started again. I went to help.sap.com and entered "profile generator" in the search. I then added the filters for "SAP Business Suite" and then "SAP ERP". This is the result I got:
The first link jumps to the profile generator glossary entry in user and role management of SAP NetWeaver Application Server for ABAP in the ERP 6.0 release:
Profile Generator - Identity Management - SAP Library
That probably is not exactly what you are looking for, but you are in the right neighborhood. If you can give me more information about what it is you are looking for, I can help you more.
I would also be curious to know how you did your search to land in the 4.5 documentation. If I enter "authorizations sap" in google, my second hit is release 7.02.
Sorry you had such trouble finding what you are looking for.
-Michael