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Before I go creating any new fields, is there any existing field besides Customer or Lead Type that was designed for an SIC code or a Business Category? 

 Yes, I watched the webinar. I understand how to assign roles, add permissions, etc. But the webinar does not answer the question I asked above, which is, is there someplace where I can see a listing of the screens and actions that the "Manager" role, for example, provides permissions to.

Is there somewhere that I can see the specific permissions assigned to the pre-defined Roles? The descriptions on the Roles tab are pretty general.