How to achieve sub-task in a task using Issue Matrix

This can be achieved using existing functionality of Issue Matrix (IM):

  1. Create a separate IM field for sub-tasks.

  2. Specify which columns are relevant to sub-tasks.

  3. Add the new IM field as a column in the Epic IM field.

  4. The sub-tasks of each issue inside the epic are shown on that line as well.

Check out an example on how it looks in the screenshot below:

 

Find the below example for reference:

  1. Create respective fields in the sub-task custom field as shown in the below screenshot.

     

  2. Create respective fields in Epic custom field as shown in the below screenshot.

     

  3. Refer to the below gif for reference.

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