Since subtasks belong to an issue, you need to browse to the issue first before you can create a new subtask by going through the following steps.:
- Browse to the issue you wish to create subtasks for
- Select Create Sub-Task from the More menu
You will see a familiar Create Issue dialog box; however, one thing you will notice is that, unlike when you are creating an issue, you do not select which project to create the subtask in. This is because Jira can determine the project's value based on the parent issue. You will also notice that you can only select issue types that are subtasks.
Other than these differences, creating a subtask is no different than creating a normal issue. You can customize the fields that are shown in the dialog box and choose to rapidly create multiple subtasks by selecting the Create another option.
Once the subtask has been created, it will be added to the Sub-Tasks section of the parent issue. You will see all the subtasks that belong to the issue and their status. If a subtask has been completed, it will have a green tick next to it, as shown in the following screenshot:
