You need to add subtasks to your issue type scheme.
https://confluence.atlassian.com/display/JIRA/Associating+Issue+Types+with+Projects
thanks, unfrotunately that doesn't work... I created a new scheme "trizic" associated it with my project but still have no subtask-- here are my screenshots
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Well you can't create a subtask via the create issue button. You can do this only from a standard issue type.
Open an issue and check your options under the "more" button.
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