Final answer:
In MS Project, to create a subordinate task, click on the Indent button in the Task Tab>Schedule group. This will make the selected task a subtask of the task above it, creating a hierarchical relationship between the tasks.
Step-by-step explanation:
In MS Project, to create a subordinate task, you click on the Indent button.
This button is located on the Task Tab in the Schedule group.
By clicking the Indent button, the selected task will become a subtask of the task above it, creating a hierarchical relationship between the tasks.