Yes, see https://confluence.atlassian.com/jira/how-to-display-custom-field-of-the-sub-task-in-the-parent-issue-screen-163939652.html
I don't see Advanced Settings. What am I missing?
I think you might be missing system admin rights? You might only have Jira Admin rights. If you are on Server, you'll need to ask your System admin to take a look. If you are on Cloud, then you don't have system admin rights.
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