Multiple External IDs Can Be Added

Customer data can specify multiple external IDs of the same type

When editing customer data, multiple external IDs of the same type can be specified

All external IDs can be viewed when viewing customer data

When importing/exporting, if there are multiple entries for a single type of external ID, separate them with a half-width semicolon ";"

When importing/exporting, if the customer has multiple external IDs of a single type, separate them with a half-width semicolon

https://support.vitalyun.com/en/?catid=28&id=5977%3Amultiple-external-ids-can-be-added&view=article

Customer data can specify multiple external IDs of the same type