Check that your company file isn't too large to export. The QBDT company file must be less than 350,000 targets. You can use the Condense utility if that isn't the case.
When you're ready to proceed with the conversion process, follow the steps below:
Sign in as an admin to the company file you need to import.
Go to the Company menu, then select Export Company File to QuickBooks Online.
Press Start your export.
Sign in as an admin to your QBO company.
Choose Yes to import inventory items if you use them, then specify the as of date. Otherwise, hit No.
From the Choose online company drop-down menu, choose the correct QBO company.
Hit Continue.
Type in Agree in the text field, then press Replace.
Tap Yes, go ahead and replace the data, then click Replace.
Do you wish to migrate data from QBD US to QBO US? If you are using an outdated QBD version, utilize the trial license of QBD 2021 to upgrade your file prior to migrating to QBO.