Sorry that my post wasn't clear enough. Basically merging one edited project into another along with all the markers.
Merging the edited project is not a problem, but I have yet to figure out how to merge the markers & region markers along with the edited project.
Thanks for your help

I don't know how you would do that in Movie Studio. Sorry.

You can merge projects by copying media events into another Movie Studio session but markers, like envelopes, are track events and these can't (afaik) be copied. The way I proceed is to edit a project then copy the media events to a new, blank project. Edit the next and copy the events to the end of the previous one, and so on. When I have completed I then proceed to set up any markers and/or envelopes (also track FX's if required),
A bit fiddly, but if your workflow requires you to edit small projects which eventually will be parts of a larger project then that's the only way to do it.