Based on the status of the parent, I want to update the subtasks status.
That is when the parent = "completed" status, the subtasks should be = "completed" as well. Do you know if we can do this without using a plugin?
That's not possible without a plugin. The way to do this is to add a workflow post-function to the workflow of the parent issue type which will transition all sub-tasks to "completed".
Here's a sample of how to do this with script runner:
and a recent related question https://answers.atlassian.com/questions/38745845
There are also other plugins that you can use to achieve the same result.
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