Follow the steps below:
1. Log in to orangescrum and click on the task from the left menu.
2. Click on “Create Task Group” and create a task group.
(Image-1)
3. On the left corner all the task groups that have been created will be shown.
4. Select the task group that you have created and you can add a multiple number of tasks and subtasks under the task group.
(Image-2)