@Natashca
You may have 3 options:
1. Buy a 3rd party conversion service. Contact me in private for details.
2. Use a migration tool (i.e TPExporter for Desktop and TPImporter for Online)
https://get.transactionpro.com/qbo
3. Keep your historical data on QB Desktop and start from scratch on your QB Online. You can buy a 3rd party service to migrate CoA, Lists, and Beginning Balance only to lower your cost. Contact me in private for details.
