Importing a .qbm fil to QBO

Upgrade your version to QBD 2022 Enterprise or utilize the trial version

https://quickbooks.intuit.com/learn-support/en-us/help-article/new-subscriptions/download-trial-quickbooks-desktop-enterprise/L04IY8YVk_US_en_US?uid=l6m9gnoq

Restore the QBM file and Sign in as an admin to the desktop company file you want to move.
On your keyboard, press Ctrl + 1 to open the Product Information window.
Press Ctrl + B + Q, then select OK to display the export window.
On the export window, select Get started.
Sign in as an admin to your QuickBooks Online company.

https://quickbooks.grsm.io/US

https://quickbooks.grsm.io/us-promo

Select Choose online company, then select the QuickBooks Online company you want to replace with your company file.
Select Continue.
If you track inventory in QuickBooks Desktop, select Yes to bring them over, then specify the as of date. Then, select No if you want to set up new items later in QuickBooks Online.
Enter “Agree” in the text field, then select Replace.
Select Yes, go ahead and replace the data, then click Replace.