MI-L Breaking a Polyline

[Daryl Riggins]

        I'm attempting to break a long polyline at a specific vertex.
The result would be two new polylines.  I have attempted the "split"
command, but receive an error that I may not use a linear object.  I
receive this message even when closing the cutter polyline to create
polygon.  Suggestions?  
Is there an easier method for breaking a polyline?
_________________________
Daryl Riggins, PE
Camp Chestnut Ridge
www.campchestnutridge.org