I erroneously deleted some bank records from my file. How can I retrieve these transactions and or can I reset to the previous days transactions?

To be direct with you, there is no undo button, and it isn't possible to automatically reset your QuickBooks file to how it was yesterday.

We can only bring those transactions back by uploading a CSV file, categorizing them, or manually entering them, using the Audit Log as a reference guide. You can find this by clicking Settings (Gear icon) > Audit Log. After that, look for which dates and amounts, and use that as a guide to put them back.

Let us know if you have any other questions.