Displaying title for subtotal rows
You can add a title for the subtotal rows. This option is available only on cross tabulation visuals when expansion is enabled on at least one of the Row shelf dimensions.
Navigate to the Marks menu and enter a title for the subtotal row under the Subtotal Title option.
In the following example, compare the visual on the left without a title to the one on the right with a title. In our example, we added the title Subtotal.