Thanks for posting to the Community, @9130 3491 9882 6856.

Currently, the option to add multiple donors is unavailable in QuickBooks Online.

The Projects feature allocates for one customer only at this time. That said, make sure they're in an account that's connected to your project. This way, you'll know and see it in the Project profitability report.

You may need to set the report period to All dates/Custom in the A/R Aging report to spot the transactions. Let me show you how:

1. Click the Search icon on the top right.
2. type A/R Aging Detail and then select the report.
3. In the Report period drop-down list, then select All dates/Custom.
4. Click Run report.

I know this would be valuable when we can add multiple donors to Projects. In the meantime, you can check other applications in the Apps Center that appears to have this functionality.

You can also search this within QuickBooks. Let me show you how:

1. Sign in to QBO.
2. Go to the Apps menu.
3. In the Find Apps tab, click Browser Category.
4. Select Manage Projects.

Once done, you can now inquire about other apps from there to integrate with QuickBooks.

To know more about the available functionalities concerning the Projects feature, you can check this article: Projects FAQ.

Let me know if you have additional questions. I'm always here ready to help. Take care!