It is possible to create multiple issues driven from a select list - see How to create multiple issues . However, this will not work if you need each subtask to be unique is some way (summary field, or assignee for instance) and that is not the value driven by the multiple issue field. For that, you would need to create multiple unique post function entries and use How to condition the creation of issues to get them fired depending on the selected values.
Suggest opening an issue if that is not enough info or you run into some road blocks that require more lengthy discussions.
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