You will have to create a simple web item add-on that links to /jira/secure/CreateSubTaskIssue!default.jspa?parentIssueId=<Your parent Issue>
You will need to set the location to atl.jira.view.issue.left.context.
For a tutorial on how to create an add-on, refer to http://jiradev.com/web-item.html
This question has also been answered at https://community.atlassian.com/t5/Jira-questions/How-can-I-add-a-quot-Create-SubTask-quot-button-on-a-view-issue/qaq-p/11794
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