I want to test Emma out but am in the middle of closing some bank accounts and combining them into a new one. I am hoping that after importing the data from three accounts for testing purposes I can forget all of that data once I open my new account and import it. Is there a feature to let you clear the slate and wipe all history from the account?
Yes, you can delete the bank connection in settings→account→bank logins. This will fully delete the data.