How to create sub-tasks in trello
Asked by Caz Wright:

I have a list of tasks, but need to link one task to another in the sense that one task can only be done after the other has been completed.

For example: Task A and Task B are both listed, but Task B can only be done when Task A is complete. How do I link these two tasks together, or how do I create Task B as a sub-task of Task A?


Answers:
author: Brittany Joiner
body: [@Caz Wright](/t5/user/viewprofilepage/user-id/5053304) welcome to the community! you can use the checklist feature to add subtasks inside a trello card. You can also make those subtasks be other trello cards too. If you're using Trello Standard or higher, you can add due dates and owners to those sub task, and you can drag them around to reorder them, which is one way i kinda think through dependencies.

There are also power-ups like Hello Epics that handle dependencies and parent child relationships with cards, which you might find helpful too!

comments: author: Caz Wright
body: This is great, thank you [@Brittany Joiner](/t5/user/viewprofilepage/user-id/1692248) . The warm welcome I have received from the community has been amazing!


author: Josh Fortner
body: [@Brittany Joiner](/t5/user/viewprofilepage/user-id/1692248) How do you create a sub-task checklist that is a card? If I paste a card link in a checklist, it does link to the card, but it shows the URL and I'm trying to figure out how to get the card name like in this Trello video.

<https://www.youtube.com/watch?v=SM5eMd7KuOI>

I'm trying to setup dependency automation for plan start and plan complete dates of cards.


author: Josh Fortner
body: I think I found 1 answer to my question. Looks like an automation to convert subtask items to cards has to be set up first.

I found that using Butler still puts the URL in the subtask checklist and not the Card name/title

<https://www.loom.com/share/24b6b25e15cc4797bdf8a69a1506e974>

**I have hundreds of cards already created so a way to add them as subtasks after they've been created would be great**


author: Brittany Joiner
body: [@Josh Fortner](/t5/user/viewprofilepage/user-id/5212471) think im a little confused what you're asking - are you asking about adding cards as attachments instead of checklist items? To do that, go to Attachments on the right side of card action menu and choose from Trello then search for the card or paste the link.

![image.png](https://community.atlassian.com/t5/image/serverpage/image-id/255631i243424E81E83C801/image-dimensions/232x348?v=v2 "image.png")

Or are you saying that you don't want the link in the checklist, but instead you want the card name? without seeing your automation, you'd probably want to reference the {cardname} variable instead of {cardlink}


author: Violetta Chernobuk
body: Hi [@Caz Wright](/t5/user/viewprofilepage/user-id/5053304)   

It's Violetta from Planyway:)

[Planyway power-up](https://trello.com/power-ups/58bd1f9aca72f48c8900574f/planyway-calendar-and-timeline-for-trello&utm_medium=referral&utm_source=atlassiancommunity) for Trello can help you link cards with dependencies on the timeline view. Here's how you can do it: <https://planyway.com/help/features/dependencies>

Subtasks are also available: <https://planyway.com/help/features/checklists>

![Planyway Dependencies Overview](https://files.planyway.com/assets/3.0.432/dependencies-overview.png)

comments: author: Caz Wright
body: Brilliant, thank you for your assistance [Violetta Chernobuk](https://community.atlassian.com/t5/user/viewprofilepage/user-id/4588368)!


author: Alex Koxaras _Relational_
body: Hi [@Caz Wright](/t5/user/viewprofilepage/user-id/5053304) and welcome to the community!

To my knowledge you can't link trello cards with each other, at least with out of the box trello functionalities. As [@Brittany Joiner](/t5/user/viewprofilepage/user-id/1692248) said, you can use tasks to do that. Other than that, there are power ups like [this](https://trello.com/power-ups/58c85f41d7f012a1879c7b2e/card-relationships-hello-epics), which can help you do that.

comments: author: Caz Wright
body: Wonderful, thank you [@Alex Koxaras _Relational_](/t5/user/viewprofilepage/user-id/4150197)much appreciated


author: David
body: [Creating and managing task dependencies \| Trello \| Atlassian Support](https://support.atlassian.com/trello/docs/creating-and-managing-task-dependencies/)


Tags: atl-gruland