Filter to show sub tasks of a filtered list of parent tasks

You can install the Craftforge JQL functions
https://plugins.atlassian.com/plugin/details/31601

You then create a filter

project = MyProject AND fixVersion = “1.1.1” and issuetype in standardIssueTypes() and status != Closed

Call this filter for example ‘parentIssues’

Using the JQL

issue in subtaskIssuesFromFilter(“parentIssues”)

will retrieve all relevant subtask issues.