To make a task a subtask in an Android app:
- Go to the list of tasks.
- Tap on the three dots in the upper right corner and select ‘Select multiple tasks.’
- Click on the desired task; this task will become a subtask in the future.
- Tap on the tablet icon.
- In the menu that appears, select ‘Cut.’
- Long-press on the desired task; this task will become the parent task in the future.
- In the menu that appears, select ‘Subtasks.’
- At the bottom of the screen (where the circular button is located), swipe right to left in an empty space.
- Tap on the tablet icon.
- In the menu that appears, select ‘Paste.’