Hello there, @jon44!
You can open your desktop account and re-export your company data to the online version.
- Go to Company.
- Select Export Company File to QuickBooks Online.
- Click Start your export.
- Sign in as an admin to your QuickBooks Online company.
- Under Choose online company▼, choose the QuickBooks Online company you want to be replaced.
- Enter Agree in the text field.
- Select Replace.
- Click Yes, go ahead and replace the data.
In addition, here's an article you can read to learn more creating a copy of your company data: Move your QuickBooks Desktop file to QuickBooks Online.
Lastly, I've got you these helpful articles to help manage your company in the new version: Help Articles for QuickBooks Online.
Keep me posted in the comments if you have any other questions. I'll be happy to help.