Hi DrBob
".. Newbie here. I was trying to add titles and clips between some clips I had already put into a sequence, and I seem to have inadvertently created a second "video track." I now have "Video track 1" and "Video track 2". ..
When you first open VP and start a new project you will only see Video Track 1. However, above this is a grey zone into which you can (as it says) drop Overlay Clips, Text and Images. When you do this the area becomes Video Track 2.which is an Overlay Track and a new grey drag and drop zone is created above this and so on.
Now, when you create a Title or Text it is automatically placed in the gray areaso generating a Video Track 2 . So what you have is quite normal. Note that images/Text and Titles placed on this track will play over lower tracks.In this way you can have a title with a transparent background playing on top of the video on Track 1. If you don't want clips there you can easily move them into a new position or drag them down to a lower track. VP can handle numerous tracks.
"...However, when I go to Storyboard, I don't see the clips from "Video track 2"..."
Storyboard mode will only show images and Video clips (including Titles and Text) that you have placed on the main timeline. i.e. Video Track 1. The Overlay Tracks are not shown.
".... how do I combine the two tracks into a single track? ..."
In most instances Text and Titles are better placed on an overlay track, where they don't interfere. However, if you really want only Video Track 1 to be used and you don't want to go back to square one, you can combine the Tracks. Simply grab and drag the clips/images/Text from the overlay track down onto Video Track 1 and move them into the position required. Do this without letting the mouse go. This action will insert the Image/Clip/Text into Video Track 1 but it creates a gap in the audio track. (In essence the track is split and the image/text/clip from the overlay is pushed into the split. This can be a complication to remedy if the sound for Track 1 is important. This is one reason for using the overlay track. (Images/Text/Titles do not have an associated audio track hence the gap is silent. A Video clip however will insert its own soundtrack (if it has one) into the gap. If you expect different audio for the inserted clip that's not a problem.
Hope this makes things a bit clearer. Come back if you are still puzzled.
Nat