Hello Marius Vlad Pop, 

1. Extras in the appointments (on the Amelia -> Appointments page) can be seen only when you Edit the appointment, there you will see the Extra tab. The same applies to the Dashboard page, and on the Calendar page, when you click on the appointment, you will open its modal and you will see there the Extras tab. 

2. The duration of the extra is added to the service duration for the Google calendar sync, so the time of the appointment is calculated service duration+extra duration. Could you please tell me is this is not the case for you? The extra time is not added to the appointment in Google? If you are talking about information for the extras you can add any placeholder that you will find in Amelia -> Notification to the fields Event Title and Event Description which you will find in Amelia -> Settings -> Google calendar settings. You can find all the placeholders when you click on </>Show Email Placeholders in Amelia -> Notifications, by clicking on the placeholder in the list you copy it and then you can paste that placeholder to the above mentioned fields in Amelia Settings. 

Unfortunately, they can't be treated as services, as they don't have the same functionalities/options and they are created for services, they are not assigned directly to employees, etc.