So the best way that I can explain is with examples.
Example 1 -Let's say you want all of 2022 monthly activity and you're going live 12/1/22. Start with the balance sheet ONLY at 12/31/21 (the day before the monthly data that you will bring in), then for each month of 2022 bring in the net change for ALL accounts.
Example 2 - You are going live 12/1/22 and don't care about any monthly data before hand. Bring in entire chart of account values 11/30/22 (this assumes that QB only has 2022 in the income statement accounts) and begin processing 12/1/22 data.