Subtasks
It would be good if we are able to create a subtask to an existing task.

Thank you for the feedback!
As an update, we’d like to pursue improvements to the checklist functionality in Planner, but don’t have any near-term plans.
If you’d like to vote on task dependencies/linking/referencing, please head over here: https://planner.uservoice.com/forums/330525/suggestions/13976094
We will keep you updated when there are any changes. Keep the votes coming and comments coming!
Thanks,
The Planner Team
242 comments
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Vic commented
Most important thing is assigning subtasks with the same workflow rules as assigning a user to the task level.
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Alex Larzelere commented
We would love to add the ability to have subtasks with the full data elements. The checklist functionality is helpful, but it doesn't allow us to plan out not just order, but ensure assignment, timing, criticality, etc.
Our enterprise currently have another tool that allows people to track tasks and subtasks, however it has a monthly cost per seat, and we would love to move a percentage of those users off it and onto tools that we already have a license for.
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Anonymous commented
I want to be able to break down tasks into component activities and then manage status at component level.
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Jerry Lindblom commented
Remove the limit of 20 subtasks in the checklist.
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Jerry Lindblom commented
An (from my perspective) easy way to add valuable functionality would be to make it possible to have more than one checklist in one card.
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Mitch commented
Ability to match the Agile Project Planning with sub tasks under a main task within a category bucket.
Ensure that each task and sub task is identifiable with a reference number so it can be searched.
Separate start and end dates.
Apply task and sub task hours to complete
Assign to different people
View status not started, in progress and completed. With a summary of sub tasks outstanding etc from within the main task.
Add testing / QA as a status for development purposes or make it easy to move these into different category buckets. -
Anonymous commented
This would make my life so much easier (and help me end my dalliance withe Trello and Asana)
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Brian Ouderkirk commented
Please add the ability to add multiple subtasks to the parent task that can be assigned to other people along with separate due dates.
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Anonymous commented
The ability to assign subtasks to people and due dates for such subtask is a must!
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Reece commented
We need to be able to assign subtasks to different owners with different due dates. Allowing custom fields (similar to SharePoint Task List) for tiles and sub task would also be very useful.
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C Pressley commented
I would like the ability to assign certain check box items to other members of the team.
"Review with @David" as a check box would be an example. It's not his task, but it would put it on his radar that Karen is working on a project that he will need to review by a certain date. -
John Cisek commented
It would great if optionally, a task state can be auto-changed to complete once all items in the checklist are completed (checked).
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Anonymous commented
100%. There will usually be multiple person working on a task and a single or multiple admins that will assign and track the various sub tasks. Currently the only way to do this is to create a new bucket for each task but then there is no total task tracking functionality.
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Peter Kormos commented
We need subtasks, successor and predecessor, assignable, status showing, due date assignable checkboxes, dependency, analysis which tasks were late, who was late where were problems, banner or just a small sign if an unread comment was made or an item of the checklist or a task is done within the task/plan w/o email notification.
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Adriana Rodriguez commented
Just need to be able to add date on the checklist box (and assign would be great), believe this is in another feature request.
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CB commented
Subtasks need to be assignable, have due dates, and status. They need to be actual sub-tasks, not checklists. Checklists are only useful in a multi-step task, but not if subtasks involve other people due dates. Yes, dependency should be an integral part of it too, not a separate thread.
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Nhat Hoang commented
We really need need sub-task (can be assigned to other member) in Planner
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Andrew Clark commented
Adding sub-tasks would be great but I would want to be able to also assign sub-tasks to different members.
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Steve Brugger commented
Sub-tasks would be great, but with far less development effort if the following fields were added to the checklist object, it would go a long way to improving things:
Progress, Start Date, Due Date, Assigned To
I wouldn't worry about dependencies initially, as the list of checklist items is usually short and can manually be rearranged to reflect that if needed.
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Anonymous commented
Sub tasks would allow me to organize my content. There is a major task that needs sub tasks. Making a new bucket results in too many buckets.. If I could click on a card and have it open other cards below it, that would be helpful. Making predecessors would also be great.