How can I move a user story from current sprint to previous sprint as those tasks are already completed in previous sprint.
You can manually remove the story from the current sprint.
For adding it: If it wasn't added to the previous sprint, I don't think it's possible to do it anymore though.
There is no good reason to add an issue to a finished sprint, and hence Jira doesn't support it.
What are you actually trying to achieve by rewriting history here?
I have tired bulk option => edit issue => sprint and it worked.
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