Firstly make sure that recommended settings are set.
Append all files from the necessary stakeholders.
Save a .nwf, which will be the project file.
Recommended to create a view for each level. Enable sectioning.
Select box
Select a level in the Selection Tree, and use "Fit Selection".
Change the x-/y- axis to fit entire model.
Right click in Saved Viewpoints and save the view.
Continue for the rest of the project.