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Description
The create subtask transition post function can also be used when issues are first created.
Steps
Edit your workflow - create a draft if necessary
Go to the Open step
Click on the Create Issue (1) incoming transition
Go to Post Functions
Add Create sub-task on transition post function
To prevent looping, make sure you set the condition to ignore create if the issue is a subtask:
Set other parameters as you need
Move the post function below the Creates the issue originally post function - This is important!
Looping hazard
Be careful! Your configuration must have looping prevention included. Follow the instructions carefully and make sure you test carefully on a test instance or at least a test project.
What about creating issues?
Looping hazard
Be careful! Your configuration must have looping prevention included. Make sure you test carefully on a test instance or at least a test project.
That can be done using the same techniques, but you must be more careful to set the appropriate conditioning parameters to prevent looping. Use a test instance and double-check your logic as the result of an error is bad 
. Preventing looping is more difficult with issues compared to subtasks. You will need some specific conditions according to your environment. For instance, a value for a custom field that will indicate to create or not to create an issue. Or perhaps a JQL query that will indicate to not create.
