If you're wanting to put the pieces together, it can be as simple as Select All (apple A), copy, then place the cursor where you want to add the clip and use the Add command. QTPro is a utility, it does a lot of things, but not in a very polished manner. But it should quickly let you combine a number of video clips.
After combining the clips, you can save as a self-contained movie (so there won't be trouble if you move one of the "reference" clips) or you can export to another video format.
John