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.
4. On the export window, select Start your export.

5. Sign in as an admin to your QuickBooks Online company.

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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. Select Yes, go ahead and replace the data, then select Replace.