Currently dealing with a client that wants to change an expense account to an Income account. I know its not a native function to be able to do this. Is there a workaround that can make this happen?

Create the new income account and run a saved search to reclassify all of the transactions mapped to the old expense account to the new income account.

Thank you Paul. Do you have an example of this saved search by chance?

Here is an article from my website that talks through the process: https://optimaldataconsulting.com/resources/update-segments-on-multiple-transactions-via-csv-import-in-netsuite

Thank you so much!