When you begin an Audition/Interview that Project automatically gets its own "Project Income" & "Project Expenses" section.
This also happens when you create a Direct Booking - it too has its very own "Project Income" & "Project Expenses" section.
To access a Project's Income section do the following:
STEP 1) Go to the "Income & Expenses" section. To get there either click on the "Income & Expenses" tab...
...or go to the Top Toolbar and select LOGS > PROJECTS LOG > INCOME & EXPENSES.
STEP 2) Click on the "Project Income" tab located along the top of the screen.
STEP 3) Then, select the Project Title from the drop down menu in the upper right-hand corner of the screen where it says "View Project Expenses For"
STEP 4) That's it! You are now in that Project's Income section! Add unlimited income associated with that Project.
By the way, you can tell you are in that Project's Income section by seeing the Project's Title displayed in both the field box in the upper right-hand corner of the screen and also in the middle left-hand side of the screen as well.