How do you move events and projects between Libraries in iMove 10

Question

I am running OSX 10.9.5 (Mavericks) & iMovie 10.0.5.
I am trying to free up space on my internal 1TB hard drive and want to archive events and completed projects onto an external hard drive, which has a second iMove v10 Library on.  Under V9 of iMovie this function was easy, but I am struggling under V10.
What is the correct way to move events between libraries in iMovie. 
When I attach the external drive containing my second iMovie Library, open it I can see all existing events stored (by move) under version 9 of iMovie.
Reading the Help (extract below) for this function it implies highlight the Event to move & then drag & drop into the second Library.
Shift+CMD with drag and drop onto the second library at the library name level will move Events that are not tied to a project, but for completed projects (Finalized under V9 or shared for example with iTunes in V10) it seems these can not be moved, the above function only copies them to the second library.
I have tried all different combinations of the Fn, Ctrl, Option CMD keys etc with and without SHIFT and the ones that work for this function only copy the event. I can not seem to get an event moved once attached to a project. File - Move Event will also move Events not tied to a completed project.
I have also tried copy to a second Library & then to delete the original events.  Again it appears you can not delete events tied to a Project.
What I have also not been able to find is how to move a finalised Project to another Library and then see if events attached to that project would then move.
I have been able to move Events not tied to a Project to the second Library, then create a new project within this Library.  This helps with all new projects & future import of Events. But does not help me free up current space by archiving.
Extract from help
Copy or move projects, events, or clips between libraries or storage devices
         Connect a storage device that contains the target library to your Mac, or copy the target library to your Mac.
         Choose File > Open Library, and choose an option from the submenu.You can choose from recently opened libraries, locate an existing library on your Mac, or create a new library.The selected library is opened in the Libraries list, with the first event selected and its contents displayed in the browser.
         In the Libraries list, select the event that contains the item you want to move or copy.
         In the browser, select the item you want to move or copy.Tip:  To select multiple clips or projects in the same library, hold down the Command key as you click the items you want to select, or drag a selection rectangle around the items.
         Do one of the following:
To move items between events or libraries: Drag the clip or project to another event or library.
To copy items between events or libraries: Option-drag the clip or project to another event or library by first starting to drag and then holding down the Option key as you drag.
Would appreciate any help on this matter.
Thanks
Colroy

Answer 1

Further to my original post below; I have done further analysis and it seams that if you have events tied to a project (mine are all finalised) you can not move events between Libraries.  However, events that are not tied to a project can be moved. Either by Shift CMD or by using File- Move event.
What I have not been able to find is how to move a finalised Project to another Library and then see if events attached to that project would then move.
Copy works for events attached to a project. I have also tried copy to a second Library & then to delete the original events.  Again it appears you can not delete events tied to a Project.
Does anyone know how to archive (move) Projects and/or events in iMovie 10.0.05 under Mavericks 10.9.5 to a second library on an external drive.
Thanks
Colroy