Sub-tasks (Checklist)

Sub-tasks break a task into a checklist of smaller steps. Each sub-task can have its own assignee, dates, description, and files, and is ticked off as it is completed.

Where to find it

How to add a sub-task

Open the task.
Go to the Sub-tasks / Checklist tab.
Click Add.
Enter a Title and any other details.
Click Save.

How to complete a sub-task

Tick the sub-task to mark it complete. Completed sub-tasks are shown struck through. Untick to reopen it.

Fields

Field	What it does	Required
Title	The name of the sub-task.	Yes
Start Date	When the sub-task begins.	No
Due Date	When the sub-task is due.	No
Assign To	A single assignee, chosen from the parent task's assigned people.	No
Description	A rich-text description (on the edit form). Supports @mentions.	No
File	Click Upload File to attach one or more files to the sub-task.	No

Comments on sub-tasks

Each sub-task supports its own comments, so you can discuss a single checklist item without cluttering the main task.

Permissions

Permission	Controls
View sub tasks	Seeing the checklist.
Add sub tasks	Creating sub-tasks.
Edit sub tasks	Editing sub-tasks.
Delete sub tasks	Deleting sub-tasks.

Tips

A sub-task's Assign To list is limited to people already assigned to the parent task — add someone to the task first if they need a sub-task.
Use sub-tasks as a lightweight checklist for routine steps that do not each need to be a full task.