Hello there. I understand you need to see the total of all customers with projects in Quick Books Online. Let me share more information about this matter.

Assigning multiple projects to one customer is unavailable in QuickBooks Online. This feature is available in QuickBooks Desktop as we can only have one customer per project in QuickBooks Online.

Alternatively, we can export the projects to an Excel file and combine the amount within the spreadsheet.

Let me know if you have concerns.