Hi HMorton

Simplest method that I know of to get all the edges selected like what you are attempting is

1 Go into wireframe (in edit mode hit Z and will be in wireframe)

2 make sure you are in vertices selection hit B for bounding boxand select all your top verts (this usually works best if in Front Camera Ortho

3 with all the verts selected which I assume from your photo would be the points that look like triangles change from vert select to edge selection and all your edges will then be selected so you wont have to select each indivual edge one at a time.

Hope this helps might a step or two more than you want but once you do it a couple of times really not time consuming at least thats how I would accomplish it. Sure someone might have a even shorter route

Good Luck

Lobo3433

Blender Maya & 3D Forum Moderator

Renderosity Blender 3D Facebook Page

Forum: Blender

Subject: Selecting "open" edges?