What will be the best way for sectioning

The lines are just a way for user to define a path

between two points ( nodes )

User will select two nodes consecutively to define each line and we will represent those selections by these lines.

So can I draw simple lines using strokes ??

Yes, if you don’t want the user to draw those lines but you want to define them in your application after the user has selected two nodes, you might want to just use GoStrokes instead of GoLinks.
I suppose this is also similar to the OrgCharter application, where the user can click on two nodes as another way of linking them together, except that you wouldn’t actually be creating any links.