Importing Sub Tasks
The Connector's import functionality allows you to specify how you wish to handle sub-tasks.
There are two different options for importing subtasks.
Indent subtasks during the import - This option will import and indent the sub task under the parent issue.
Import subtasks on the same level as the parent task - This option will include the subtask during the import but it will add it as a top level task at the same level of its parent. You can optionally choose to include the parent issue or exclude the parent issue (if it is not already included in the project plan).