A big Task can be split up into smaller tasks or subtasks. All Subtasks will be mapped under the parent Task. The subtasks can be assigned to different members of the team.
Zoho Projects allows you to break your existing tasks into subtasks. By creating subtasks, you can organize your work. With subtasks, you can track the progress of the task and get it done on time. Alike tasks, you can set the priority, duration, % ...