Here is my Overlapping Credits Tutorial using Vegas 6.0.
1. Open Vegas 6.0
2. Click on Media Generators and select Credit Roll.
3. Drag the particular style of credits and put it after the montage (I always use Plain Scrolling).
4. Type the information you want on it in the box.
5. Drag the clip you want to be featured on the credits into a new video track (Directly below the Credits).
6. Right-Click the credits clip and select Video Event Pan/Crop
7. Zoom out of the Pan/Crop preview screen and stretch the dotted “F” Box to the left (You can adjust it to whatever size you want the credits to be in correspondence with the video clip).
8. Right-Click the video clip and select Video Event Pan/Crop.
9. Do the exact same thing with this one, except stretch the “F” Box to the right.
10. You can add music to your liking and adjust the fades as much as you want.
Hopefully this Tutorial will be helpful. (Can one of those Sexy Mods sticky it?).