I've some issues resgistered on my scheme, but I want to use the 'sub-task' just in one fo them. Is it possible?
No, all sub-tasks are available to all issue types in your project.
You can play tricks with javascript or the behaviours-in-ScriptRunner addon, but those can be bypassed and the javascript is a nightmare to do or maintain, and you need to implement it in several places.
You can also deliberately break the sub-task workflow so that people can't create the wrong "type", but that's quite ugly.
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