How to display the project total planned hours and actual hours in PPW?

In a tasks view, if the project is not too large, you can add a summary task and indent the other tasks under it. The planned hours and actual hours will then be rolled up to the summary task in the task view.

There is not an equivalent solution for task assignment views. You could add a report that displays the project information to the Actions menu of the project.

An enhancement request has been submitted for consideration in a future release.