Thank you for all the help.

I want to ask my question a little differently.  I have absolutely no interest in having or using the data prior to Jan 1 2023 that is in my current QBDT 2023.  That data I have access to in our old software (QBDT 2020, without it having gone through the data migration process, and thus our confidence in that data is much higher). 

How do I GET RID OF all transactions prior to Jan 1 2023 in QBDT 2023, and then I can set about reconciling this year's data.

Thanks again.