How to create a copy of the Peoplesoft User role

I have been meaning to make a copy of the Peoplesoft user role for our employees instead of them using the Peoplesoft user role. I would like to remove any unnecessary menu items they do not need access to. I know how to make a copy of the role but I need to understand what key permissions/components that are required for the login page to work.

I would appreciate your suggestions on the best way to accomplish this task.