The setup is similar to the setup of the Additional field to populate custom field to the transaction with the following differences during the step 3 - adding the logic in the Bank Account Configuration:
- User needs to select the specific Additional field type to Additional Multi-line Journal Field
- Populate the record ID of the custom field into the SOURCE RECORD/FIELD
- Give a name/label to the field in the Multi-journal popup into the MULTI WAY JOURNAL FIELD LABEL