I'm a new user and this may seem a very basic question. I have uploaded a number of different movie clips from my camcorder. I have then used these different clips to create a number of different projects I want to combine all the projects I have created into one new project - can this be done and if so how?
You can combine movie (*.MVD) files. There's a function specifically for this purpose under the "File" menu => "Manage movies" sub menu => "Add movie..." command. They must all have the same sample rate, though. You might have to export all your projects to MVD files via the same menu first, before you can join them this way.
Naturally, you can also export all your projects into actual video files (e.g. MPEG-2 or MXV) via "File" => "Export movie", and then re-import all these files into a fresh project and line them up in the timeline.