My goal is to display the Summary of the Parent of a Sub-task. Appreciate the help! Thanks!
You can create a script field. Here is a code to get summary of parent issue
import com.atlassian.jira.issue.Issue return issue.getParentObject().getSummary()
Thank you so much! I would like to learn more abour scripting. Can you point me to the right documentation?
You could start with documentation on JIRA API for your JIRA version.
Here is an exaple: https://docs.atlassian.com/jira/server/
https://scriptrunner.adaptavist.com/latest/jira/quickstart.html
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