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I assume by unique Id' you mean fields form the form design, you can just drag them from the selection list on the left hand side, pre 2016.2 the values are GetSRPValue(recId, parameterFieldName) post 2016.2 you can just reference the values as a normal field e.g. $(first_name_some_other_text)
Screenshot from 2016.2 system
That worked, thank you!