Similar to the budget tracking level on the Project, but for individual Phase.
The options are:
Track time on Phase level:
Track time only on Phase level, not on work categories
All timesheets and work plans will show under Phase Time category under this phase
Track time by Work Categories:
Allow creating Work Categories under each Phase and Subphase and track time on Work Categories
Do not track time:
Do not track spent time and planned time
Do not allow entering timesheets or creating work plans.