@MichelleMM1 

You may have 2 options:

1. If you are using QBD Pro/Premier 2020 or 2021, purchase a one time license of QBD 2021 Accountant for 1 user.

2. Utilize a migration tool. Export your data out to XLS, modify the class, import it back into your company file.

https://transactionpro.grsm.io/qbd

https://partners.saasant.com/affiliate/idevaffiliate.php?id=5051_2