QBO doesn't offer any assembly feature. Consider having an additional app to integrate with your QBO account or switch to QB Desktop Premier. You can still purchase a one time license of QB Desktop 2019 if required.
As much as I would love to help you, I need some specific information to give you a possible resolution to this concern.
May I know the challenges you're encountering at the moment and what doesn't seem to work? This allows me to use my resources to check for any possible resolution.
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