Hi there, @cnmnon11.

Yes, you can convert your QuickBooks Desktop (QBDT) Enterprise file to QuickBooks Online (QBO). I'll guide you on how.

1. Sign in as an admin to the company file you want to import.
2. On your keyboard, press Ctrl + 1 to open the Product Information window.
3. Press Ctrl + B + Q, then select OK to display the export window.
4. On the export window, select Get started.
5. Sign in as an admin to your QuickBooks Online company.
6. If you track inventory in QuickBooks Desktop:
   • Select Yes to bring them over, then specify the as of date.
   • Select No if you want to set up new items later in QuickBooks Online.

     Note: Only QuickBooks Online Plus and Advanced can track inventory. Both plans use the FIFO method.

7. Select the Choose online company dropdown, then select the QuickBooks Online company you want to be replaced by your company file.
8. Select Continue.
9. Enter “Agree” in the text field, then select Replace.
10. Hit Yes, go ahead and replace the data, then select Replace.

Once your data is available in QBO, you can review the details to ensure a smooth migration. 

On the other hand, restoring your file from QBDT Enterprise to the other version of QBDT may vary. You can convert the file into a higher version but downgrading it is unavailable.

If you have any other questions while converting your file, let me know by adding a comment below. I'm always here to help. Have a good one!