"append" a model in navis and specify in which hierarchy it will be imported

[julia_morseP8AHB]

Is it possible? Attach the item to the model in Navisworks Manager and specify which hierarchy it will be imported into. 
Using API Navis Manager, of course.

[cation234ctci]

To my knowledge, it is not possible. Models are always imported at the top level of the Document root.