Hello there, Newbie1987.
When we convert our company file, we don't start over again so the data are still the same. We mentioned that we want to start fresh by retaining other transactions and add new one.
We can create a new company file from existing ones. Through this option, we can copy accounts, lists (customers, vendors, items, etc.), templates, and preferences from an existing company file to get started. For the detailed steps on how to do this, you can check out this article: Create new company files from existing ones in QuickBooks Desktop.
Our accountant will also help us on how to remove or clear out the retained earnings. This way, we won't mess up your books.
I'll be here if you need anything else. Thanks!