Phase or Task (Sub-Level) Billing Terms
If your project has phases or phases and tasks, a Sub-Level Terms tab appears on the Billing Terms form. These settings determine how the phase or phase and task-level information is calculated, presented, and posted, and determine whether or not phase or task level terms can be defined for the project.
When your project has phases or phases and tasks, the Sub-Level Terms tab is automatically enabled for editing. However, you cannot open a phase or a task to save billing terms for the phase or task before you: