You can view the details of the project by clicking on the respective project in the Project Listing page and then clicking on the Details tab.
Hovering the cursor on any of the milestones, show a few inline options.
Clicking on any of the milestones, shows the tasks assigned under it.
Adding a Task
Editing a Task
Existing sub tasks under a task can be seen by hovering the cursor on the task and clicking on the sub task option.
Adding a Sub Task
Editing a Sub Task