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Go to Metadata Management > Spatial > Geographic Unit Relationships.
Click Import Geographic Unit Relationships.
Click Choose File.
Choose a format from the dropdown menu. This will likely be xls(x).
Click Submit.
Confirm the import.
Troubleshooting relationship table uploads
Possible errors when uploading relationship tables include:
Extra columns: If the file contains extra columns that are not recognized by FDW, the upload will fail with an error message that notes the unidentified metadata. Remove the extra columns before re-uploading the file.
New geographic units: If the file contains units do not already exist in FDW, the upload will fail noting the unidentified units. Upload the new units to FWD before re-uploading the file.