Custom fields and alternative code on Geography

Summary:

Good morning,
is it possible to add a custom field on the geographies section? Also, using the CSV file for bulk upload,
is it possible to insert more than one alternative code? For a municipality for example, we want to add two codes in addition to the name.

Best Regards,

Teresa

Content (please ensure you mask any confidential information):

Good morning,
is it possible to add a custom field on the geographies section? Also, using the CSV file for bulk upload,
is it possible to insert more than one alternative code? For a municipality for example, we want to add two codes in addition to the name.