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Prior to version 3.3, in order to create multiple issues or subtasks, you needed to configure a Create issue or Create subtask post function for each issue to be created. Version 3.3 adds an option to make it easier to create multiple similar issus issues (or subtasks) with one post function. Multiple post functions can still be used and may be needed for creating issues with unique settings or to use different conditioning. Also see: How to create multiple issues - advanced example.
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