is it possible to create an issuetype that is able to stand alone and as a child of an other issue type?
For example like the issue type "Story" you can create a Story as a stand alone issue or you can create a Story as a child (sub-task) of an epic.
Thanks a lot for your ideas.
No. An issue type is either a parent type or a sub-task type. The closest you can get is to have one of each with slightly different names, but it's still two types.
However, the relationship between Epic and Story is not issue/sub-task, it's a separate function. You can (sort of) have Epic -> Story -> Subtask
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