Hi Dave, Was dragged into other territoties and had to get off this project for a bit. Thanks for your response.
Responding to your question, "So you want to select only the edges in the model or at least within a selected region? You could select all of the geometry including the faces"? :
Ideally what I was looking to do was select (in the example image) only the line [and all its connected segments] between the hand-drawn blue endpoints/arrows. I probably should have colored that entire length. This section of line (essentially 4 connected arcs in this case) is co-planar with all the other visible elements. So I don't believe its not categorized a true "edge"; its a kind of "island edge" submerged within the larger face.
The select/deselect method is one that I often use (or version of that toggling between face/wireframe visibility) - but in this case the trick is selecting just that area without selecting other edges (which would also then remain selected). If I were to do that a be left with multiple, connected edges, I'd either still need to manually, individually deselect segments (if the curves were 'broken'), or arcs (if they were true welded arcs). For some reason, 2x-clicking to remove the unneeded lines/edges as entire connected lines was not working - and 3x-clicking was reselecting the faces.
Thx