You can use the "System field defaults" built in template to create the new rule. This will create a new rule that triggers when a new issue is created, and edit the newly created issue:
Project automation - Code Barrel JIRA 2016-09-20 11-04-23.png
It shows an example, of how to change the description, assignee and labels (using advanced fields). With advanced fields you can set any field on the issue to any available value.
There's also a "Create sub-tasks" action in the list of available components if you want to create sub-tasks for the new issue.
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