I don't know if I can use my backup through 1/3/2023 and have someone just do 2023. I am not sure, but if I tried to just add 1 year, it might wipe out the previous years.
Due to conversion limitations, you will find differences between your old QB Desktop file and the converted file from QB Online. You may consider the following steps:
1. Convert data from 1/3/2023 from QBO to QBD
2. Merge 2 QBD files (optional)
Contact me in private for details.
