Currently Being ModeratedFeb 6, 2013 4:55 PM (in response to Ron73)
Trailers are designed to be idiot proof complete movies that provide complex effects and match a music track with not a lot of knowledge required.
However, it is possible to convert the trailer to a project and then you can edit it with all the capabilities of iMovie.
To do this, fill in as much of your trailer as you want or need. Then go the the Project Library View - so you can see all your projects at once.
Select your trailer, and click FILE/CONVERT TO PROJECT.
Now you can edit it as you would any project. You can delete everything except your globe, for example.