Its possible to import your animation back into SMP if you want to use it as source material for matching movement or doing continuity checks.  Here's how...

Export the source animation as an AVI file.

Start your new animation capture project.

In Animate mode, scroll down to find the Rotoscope track.  Click on the folder icon to locate your source animation AVI.
Locate the animation and Open
You may need to use the navigation tool to locate the animation when it appears.  You can click and drag on the rotoscope track to position the animation just where you want it.
Now you can use the transparency slider on the rotoscope tool to adjust the transparency.  As you step through the animation it will automatically update.

As you capture frames the animation will sequentially step in sync.