QuickBooks Import & Export data | QuickBooks API Integration
Adding custom fields to existing tables is not supported as a populate or refresh operation will delete the tables that will be populated.
Parent tables have a field that is meant to be used by you:
UserData: you will be able to add any data to this field that can link this record to another database that this record is coming from or going to.
In order to field to be supported. You have to check “Support Userdata field” on setting.
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