How to create a story which contains task from different projects

[Praveen Dara]

I have three different projects.
Let's say: A, B, C

These projects has different tasks.
Lets say A-> a1,a2,a3...
B -> b1,b2,b3...
C-> c1,c2,c3...

In order to implement one user story different tasks needs to be done from two or more projects.
Let's say a story would contain a1, b2, b3, c3

So how can I create one user story which can include (a1, b2, b3, c3) which are from different projects (A,B,C).

The problem I face:
If I create a story under project B then I can no longer add a1, c3 from other projects.

[Nic Brough -Adaptavist-]

Welcome to the Community!

You do not do this.

Issues do not contain sub-tasks.  A sub-task is a part of an issue, not a separate entity.

You can't have a parent item with sub-tasks in a different project.  By definition, a sub-task is in a project because it is part of a parent issue that is in the project.

My usual example on sub-tasks is a comparison aimed more at people not understanding what a sub-task is in a sprint context - your story is "Charlie wants to complete a park run".  in terms of sprints, you wouldn't enter Charlie into this week's sprint, and Charlie's left leg into the on next week.  It's similar for projects - Charlie's left leg is in the "Charlie" project because Charlie's sprinting is in the project and the left leg is a part of it.  Charlies left leg wouldn't be in project "Bob"...

[Praveen Dara]

Ok

[Nic Brough -Adaptavist-]

That is what I said.  

[Tash]

so how do you handle the scenario? Should we be linking them. From a portfolio management perspective, I want to create a parent ticket which will result in child tickets that would need to go into different project boards. How do I do this correctly?