The point of a sub-task is that it is part of the parent task. So if the parent task is pulled into a sprint, it's nonsense to try to put its parts into another sprint. If you find yourself wanting to do this, then you need to split up your parent tasks better.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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