You'll need code. JIRA can default some of the system fields, but that's it. If you want to "inherit" more, you'll nee to write code to duplicate the things you need.
I'd strongly recommend not duplicating the summary though - it should be indicative of what the sub-task is for as part of the whole, not just a copy of the parent.
So, what is the settings for "Update parameters of the Copy Value From Other Field Function for this transition." and "Update parameters of the Set Field Value from Parent Function for this transition." are not configuring or set the value of field inherited from parent issue to sub-task issue?
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