The extended import gives the possibility to remove the selected contact, based on the contact number.
If its used for remove contact that mis-imported --> Applicable to contact that imported and has no modified since then.
...
- Authorization, criterion, indicator, note and address.
- Contact Advantage and Connection.
- Contact organization info.
- Contact quality, relation, group member, vip performance and waiting list.
- This action is irreversible.
Describe here the key that identify the contact to be updated
The details and more fields are found here: Contact import Format (Extended).