On each task you can add unlimited sub-tasks from sub-task section.

Add subtasks

Just open task and scroll to subtask section.

subtasks

Click “Add subtask” to create new subtask.

You can check each subtask to mark them as finished.

Edit, delete subtasks

You can easily edit or delete subtasks by clicking subtask text. Then you will be able to edit / delete subtask.

subtasks1

Reorder subtasks

Subtasks also can be reordered. Just drag and drop subtasks to desired position to reorder them.