So my question is do i have to know the entire structure of property and casualty or its enough if i already worked with insurance companies.
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How would we know that?
Only the hiring manager could tell you the answer. Perhaps you should contact the company and ask. It will not detract from you chance of getting the job to be inquisitive concerning the requirements of the position. In fact you should find out as much about the company and their processes as possible prior to applying as this will impress the hiring authority. And help you be at ease in the interview so you can concentrate on what really matters.