Thank you Michael,
getSubObjects() will be useful but actually Brians and your suggestion to seperate a multiline does what I need.

But I run into another problem:
I'm trying to use MoI to draw tool paths and then use a script to generate xy coordinates for a CNC router and for this I would need a way to break up freeform curves or arcs into lots of segments.
I thought REBUILD generates new points on a freeform curve or arc but now I see that it only generates more control points.
I would need a solution to generate new points on a freeform curve or arc like shown below. The points on the right are not control points but "real" points drawn by hand using the multi line tool. Is this possible?