I want to fetch the parent issues along with subtasks without using any plugins.
If I understand what you're asking for, I don't think you can accomplish that without ScriptRunner or another plugin that extends JQL.
You might be able to work something out using the Parent function, which will find sub-tasks of a specific issue, but I think that's more limited than what you want.
ref: https://confluence.atlassian.com/jiracoreserver/advanced-searching-fields-reference-939937719.html
Hi @testcase1062
By using basic filter option choose parent custom field and later parent = 'choose your parent issues by using multiple choice'.
In result, it will provide all the child issues of chosen parent issues.
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