Hi there. Glad to have you reach out to the Community. I'll be happy to share info about the Projects feature in QuickBooks. Based on what you've described, I recommend adding the income sources to the Projects by following the steps below: 

1. Click the New (+) icon.
2. Select Invoice. You can also use Sales Receipt.
3. Choose the project from the Customer drop-down menu.
4. Enter the necessary details for the invoice.
5. Click Save and close.

If you need to do this for expense transactions, follow the steps below: 

1. Click the New(+) icon.
2. Select Bill/Expense.
3. Enter the Supplier, Bill Date, Due date, and Bill no.
4. Fill in the necessary details in the Category details or Item details section.
   - Make sure to enter the correct project in the Customer/Project field.
5. Click Save and close.

Give this a try and if you have further questions, don't hesitate to reach out in the comments below.