Hi there, @TveterConsulting.
I can share some insights about the Date field on the Reclassifying transactions screen in QBOA.
The default date range on the Reclassifying Transactions screen is the previous month. You will have to manually reset the date range if you'd like to view previous transactions.
The specific functionality that you're asking about isn't available at this time, but I will forward this request to our product engineers so this will be considered for future updates.
I also suggest that you leave feedback for them through this link: QuickBooks Online Feature Requests.
If you have additional questions, please let me know. I'm always here to help. Have a great day.