If the Ask to add new vendors before exporting setting is selected, every time a transaction is submitted with a vendor that is not part of the QuickBooks' vendor list, TALK will not export it. The transaction will be marked with the New Vendor label instead, and the user will have to handle this before it can be imported. If this setting is not selected, new vendors will be added to QuickBooks and the transaction will be exported automatically. To enable this setting, simply click the switch inside the QBO Integration tab and click the Save Button.
For a detailed explanation of how to handle new vendors see the Handling new vendors article.