How do you load a Part completely?
Including every single component that is under it's RootComponent.
When I say fully loaded I mean that when I go to the Assembly Navigator tab in my NX session, right click my displayed part, the "open" option won't be there because every part is fully loaded.
In Gateway, Assembly Load Options uncheck the 'Use Partial Loading' then assembly will load fully.
If assembly is loaded fully, in ASN you will not have 'Open' option for the component/subassembly.
Now close the component > RMB, there you have 'Open' option to load the component/assembly.