Editing a job from the schedule section?

Maybe I am missing a button somewhere but...

Is there a way to edit a job (add a product or service, change unit prices) from the schedule menu? A client calls before I am at the job and wants to add a certain service to the job booking, so I click on the job from the schedule menu and all I can change is the quantity, service date/time or Job Title. Even when I click Edit or View Details I still can't change any of that information. 

Does anyone have a work around rather than having to click out of the schedule and go into the Jobs section?