Ian,
In Creo 2 you can show the annotations at the part or assembly level. If you have already saved your annotations at the part level, open your assembly, go to Annotate tab and choose Show Annotations. When you pick the desired part the only annotations that will appear are those pre-determined at the part level. If you pick a feature in the component that doesn't have any pre-determined 3D annotations nothing will show up.
You can also select your part feature and choose Show Annotations from the Right Mouse Button popup menu.
Hope that helps!
Mike Brattoli
Moen Incorporated