In Sage 50 you can work on your current fiscal year and the immediate prior fiscal year. Right now you can use 2023 and 2022, however, once 2024 is opened you loose access for entries in 2022. If you need to go back more than the immediate prior fiscal year I would suggest doing a manual reconciliation as at the earliest point you can work in Sage 50 and then set it up and move ahead using the reconciliation module.