Using Exchange>Data Exchange>Import
Table: Metric engine Hints (me_hints)
Selecting *Specification link to view the fields required
Fields are Mandatory when they are not -
(import_account_id, Import_org_level_2_id, and import_product_path_id)
The fields are marked as Mandatory and XOR which means just one of each XOR is mandatory and not all.
It's a bit unclear but no wrong.
Importing Metric Engine hints can be problematic.
The Recommendation is to first do a 'manual' entry of a Metric engine hint.
Afterwards search and Export the record so you can see the data and format that is required for the full import.