We explained the difference between the a visit and a property in this article:  http://help.wavehousecleaning.com/en/articles/3643425-what-s-the-difference-between-a-property-and-a-visit

Now that you understand the difference here is how you can manage the extras for a property or a visit:

Property: Go to the property page > select your property> click on the edit icon

Then you will be able to manage your extras for this property:

Visit: Go to the Calendar/Visits page > select the visit you would like to manage > click on the edit icon

Now you can manage your extras for that specific visit.

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