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Ben,
In CCSv3.3 there was a tool called component manager that allows you to control which version of BIOS or the compiler CCS is using. In CCSv4 it works differently. If you go to Window->Preferences you can tell CCS where your BIOS installations are located.

Then for each project you can choose which version of BIOS it uses.
Regards,
John
Ben,
I have filed SDOCM00077165 to track the issue with the help. The issue is that BIOS5 releases are designed to work with both CCSv3 and CCSv4 but the help only has the instructions for CCSv3.
Regards,
John