You've come to the right place, @mapfitness.
Yes, you can import your old transactions in QuickBooks using a CSV file. Let's first download your bank transactions. Then make sure that it meets the file format so it will be imported successfully.
Also, you’ll need to delete the two zeroes entered in the decimal places. Here's how your file looks like when it's ready:
Once verified, you can re-import your transactions following the correct format. You can use these articles for more detailed steps in importing your transactions:
Also, here are some articles to help review your bank and credit card transactions:
Leave your comments below if you have other questions. I'm always here to help.