Pick CV
Picks or unpicks CVs on curves, NURBS objects and subdivision objects. If a CV is already picked, hold the Ctrl key and press the arrow keys to pick surrounding CV, edit points, hulls or blend curve control points one at a time.
When working with scanned data, you can use the Pick CV tool to pick section data points.
Access this tool from the Pick palette:
Pick CV Options
Use Lasso
Dragging the mouse draws a lasso around the CVs you want to pick, instead of a box.