Couple of ways to do this.
If you have Script Runner, you can use behaviors.
If you have cPrime Power Scripts, you can use live fields and add a hook/watch to that field and script the issue creation.
I believe it can be accomplished with the Automation for JIRA plugin as well.
Srikanth -
You can start by reviewing the scriptrunner doco and look at samples. https://scriptrunner.adaptavist.com/latest/jira/quickstart.html
and the Atlassian developer doc on creating an issue https://developer.atlassian.com/server/jira/platform/performing-issue-operations/
and this previous answer https://community.atlassian.com/t5/Jira-questions/Groovy-to-create-issues/qaq-p/818025
should give you everything to knock this out.
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