Michael,

Thanks to your email- the problem is solved.

The problem I was having is that after the trim/delete is done the newly created curve did not highlight when moused over
as other curves or lines do. I didn't initially understand that the network needs to be highlighted first before the curve(s) will highlight.
This may have been because, as you pointed out, the new curve was fragmented. Once I did a Join on the two segments, the new curve
would highlight as any other curve does.

Looking forward to completing the project.

Thanks again.

Hi David... There is a difference between curves and "surface edges"... To select a surface edge you need to do a "drill down" pick, which is as you describe, selecting the surface then the second pick will target that surfaces edge.. The same is for the faces of solids or joined surfaces.. Select the object then the face will become selectable.. The edges take precedence, so you may have to zoom a bit on smaller faces to be able to target them...

Hi David, yup Burr has described that well - selecting edges is a bit different than selecting a "standalone" curve. To select an edge you first do one click on it to select the "whole object" and then a second click will drill in to select either edge or face sub-objects.

That gives you a method to control selecting either an entire solid (with just the first click) or also going in and selecting sub-object pieces with the secondary clicks.

Check out here for some description of how selection works:
http://moi3d.com/2.0/docs/moi_introduction.htm#selection

- Michael