Sony Vegas multiple on-screen videos

[Pilotwings_64]

Basically what I want to do is compare the results I'm getting with 4 different codecs. I have a single avi file I'm starting with. I want to divide the screen into four parts and simultaneously display a small, magnified portion of the video as produced by each of the 4 codecs.
I know how to crop the video with Vegas, but I don't know how to move the cropped image to the corner of my choice. It just stays where it originally was on the screen.
Any help would be greatly appreciated. Even key words or phrases I could lookup. Since I don't know what to call what I'm trying to do, finding results has been difficult.
Thanks

[Pilotwings_64]

In another forum I was given the answer.

"Pan/Crop will let you select a small portion of each video, as you've already discovered. Track Motion will let you position those portions where you want them in the frame."

I hope this solution helps anyone else having the same difficulty.