Hello linda-familyvalu!
Thanks for reaching out to us. Let me assist you with third-party integrations.
QuickBooks Online supports hundreds of third-party software and applications. You can check the list of them by visiting the Apps menu on the left navigation bar.
With regards to Submittable software, you'll want to seek some help from their support on how to connect their system with QuickBooks Online. Also, they'll be able to explain to you how their software works.
I've added some links you can check. These can help you in categorizing the bank transactions so easily:
Leave a comment below if you need anything else. Take care!