I tried to import the Sub-Tasks from CSV to JIRA from Issues --> Import Issues from CSV, i couldn't find the "Parent Id" column in JIRA fields. where as i am able to import Sub-Tasks from System --> External System Import.
As a JIRA Admin, I have access to System, but i can't give the JIRA Admin permissions to Project Users to export the Sub-Tassks from CSV via System.
Any solution for this, Your advices are much appreciated.