I have created 40 tasks and then I have same set of subtasks for that 40 tasks. Is there any way using JQL I can create sub tasks (like some command which can create subtask if we provide the main task ID inside the JQL) ?
JQL is for finding issues, it doesn't do anything with them.
You need to find/write something that will create subtasks on an issue (have a look in the marketplace) when you do something with the issue - a common one is to create subtasks on a transition (if you do that with your workflow, then you can use JQL to find many issues to do it to, and use bulk-edit to push them through the transtion that creates the subtasks)
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