Found the solution to my problem.
You have to add the classes in the default client settings.
I was trying to do this in the settings group that I had created for my desktop systems.
The account I am using is set as a full administrator, so I should have access to everything.
Any other postings I have seen on this topic have mentioned doing this on the CAS server, but for my deployment I did not need one.
Under the client setting in SCCM 2012 I am unable to add a new hardware inventory class, this option is greyed out.
I do not have a CAS server, and have been unable to locate any information on how to enable this ability on the primary server or find a work around.
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