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
Atlassian ranks project attributes as the third most important factor impacting performance in the category of data. It’s not surprising, since project attributes are precisely the rules used to ma...
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