There are 2 ways to send calculated Billing Data to QB Online
1- Automatic Way: If you enable 
on Store Management, Calculated billing Data will be synced automatically to your QB account
2- Manual Way: If you want to have more control over which data to sync to QB, you can choose the lines to sync manually.
Manual Syncing Option
Screen path: WMS > Reports > Billing Reports > Billing Detailed Report
You can see all billing lines by using the 'Billing Detailed Report':
In order to send billing lines to QB, you should select the billing lines that you want to send and click on Send to QB 
button
To learn more about Billing Reports: Billing Reports
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