On the employees form, we can define which employee do not require to submit the timesheets on the project setup.
Human resources >Workers >Employees > Project tab > project setup action pane button.
All Missing Timesheets
This list page displays all timesheets for employees who are not required to submit timesheet with status ‘No timesheet required’.
Project management and accounting > projects360 > Timesheets > All missing timesheets.