To export the Attribute Import ID:
  1. Create an Individual/Student/Applicant/ or Organization export
  2. On the Output tab, select Attributes, specific Attribute, Import ID
OR
  1. Create a Individual/Student/Applicant/ or Organization import file
  2. On the Fields tab, select Individual/Student/Applicant/ or Organization Attributes, Import ID
Note: Once imported in, an import cannot be used to update the Attribute again.