After you have animated an object on a path, you can substitute the original curve with a new one to create a completely different animation.
1. Select the curve that is currently the path.
2. Choose Edit > Operator > Substitute Input from main command panel.
3. Pick the curve to be the new path. Right-click to end the picking session.
The object is assigned to the new curve.
Autodesk Softimage v.7.5