Add a Candidate to a Requisition referred by an Agent

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I am trying to create an import to load a group of students from a spreadsheet to a specific requisition and also populate the referral tab with the "Agent who referred this candidate".  Once they are loaded correctly correspondence should automatically be sent to them.  I have been able to build the import to load the students to the requisition but am struggling to add the agent who referred the candidate.  Does anyone have an import they can share with me or can direct me to the correct field in TCC for the "Agent who referred this candidate"?

Debbie Brenner