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We're unable to merge QuickBooks companies. However, you try finding a third-party app that can export and merge your data from QBO to your company file in QB Mac Desktop.
Feel free to reach back out if you have other questions. You can also check out other references on the QuickBooks Support page.
QBO and QBD are living in 2 different realms. You may convert your QBO data to QBD file format to be open on your QBD Mac.