How to know in which fields we are able to load education and previous company name for candidates

Summary:

I have to load education[school and college names] and previous company name for candidates in ORC through HDL.I took latest candidate.dat file from system.But I am anot able to see education and previous company fields in that file.Kindly let me know how to identify in which fileds we are able to load education and previous comapny names.Kindly guide me if any one have idea on this.

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