There are several ways to delete task group:
- Select required task group and click on "Delete Group" button on Task Group panel toolbar

- Select required task group and press "Delete" key
- Select required task group and click on "Delete" button on Task Tree toolbar

- Select required task group on Task Tree grid and press "F8" key
- Right click on selected task group on Task Tree grid and select "Delete" from drop-down list

- Right click on task group on Task Groups panel and select "Delete" from drop-down list

In confirmation window click "Ok" if you want to delete this task group, or "No" if not.

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