This is what I've done, as I use the same setup almost weekly (but may not be for everyone, but works for me).
Make a master video (without videos, except for a few short video place holders where you would normally insert video) to include opening and closing setup. When all said and done I have a set 30 - 45 seconds at the start and a set ending, to include credits. Music on both ends.
Save it (make a back up).
I open the master when I have a project, and
do a save as. Add video/images and change wording as needed within the newly named video, but not changing the templates. For me that would mean name of video, place, and a few other bits of information in the opening.
Make sure you get rid of the video place holders from the video before producing. Highly recommend the use of the place holders.