Tasks in Time Tracker
To track work time by tasks in addition to projects use the
project and tasks tracking mode. You can set it on the
Group settings page.

Select the "Projects and tasks" tracking mode to track time by tasks
To manage tasks use the
Tasks tab in the menu. This capability is available to users having the
manage_tasks access right (default Co-manager, Manager, and Top manager roles).

Task list in Time Tracker
The
Required checkbox on top of the
Tasks page is responsible for making a task selection mandatory on time entry and edit pages. Use the
Add button to create a new task. A screen like below appears. When adding a task you can select projects associated with it.

Adding a new task in Time Tracker
You can use the
Edit and
Delete icons in the task table to manage already existing tasks.
Time Tracker User Guide