Yes, surely. There is View Appointments page that lists all your calendar events no matter if they are set in the Job Manager App or in your mobile device. You can add appointments with clients, subcontractors or employees by a tapping on the icon in the sidebar.
If you wish to open a calendar, choose View Appointments in the dropdown list of the Home Page menu. Everything will be there – from business meetings to the events that you marked on your mobile device, independently of your work.