A csv file containing task and subtask with in that and provision to upload the template altogether . Also Add Approver feature is not there inside the tasks ?
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Yes, this is possible.
You can define an approver in the CSV import file (as long as your project implements approvals).
Task/subtask is a bit more complex. Your CSV needs to include two columns, one of which will not be imported. It is easier to explain with a very simple example file:
If you import this file, you'd get three tasks, with two sub-tasks under "Bob wants cake". Each issue will import "key" as the "external issue id", but the parent field will be lost.
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