What can Partial update do and can't do? - Endeca partial Update

What can Partial update do and can't do ? 

Endeca Property: 

 - Change, Remove, Update the property values.

 - Cannot Add, Remove, Change a property itself 

Dimension:

 - Change, Remove, Update dimension values. 

 - Cannot Add, Remove, Change a dimension itself

 - Cannot Add, Remove something in the hierarchy of dimension values