Run Reports → Accountant & Taxes → Trial Balance in QuickBooks, set the date to your cutover, and export to Excel. The file should have columns matching GL Code (or Account #), Debit, Credit — typically with the GENUS account codes already mapped (you'd have done this in Step 1 of the migration).
Optional step: if your GL Detail upload covers from day one, you can skip this entirely.
Click to choose or drag your .xlsx here