I’ve spent most of the day battling with a SketchUp model – all urves and gently sloping banks. Looks great very challenging. I came across this great tip on how to select edges using the eraser tool – very quick and convenient when compared to clicking every line separately.
Choose the eraser tool, and start dragging along the edges you want to select. Done? WAIT!! Don’t release that mouse button yet! Right click any of the edges you selected (while still holding down the left mouse button [and make sure you’re right clicking an edge, not a face]). The context menu will pop up. Move the mouse away from the menu, and you can now saftely release the left mouse button. Press Esc to close the context menu and…Volia! Your edges are still selected!
Found on the Sketchucation forums by user Justry.