Questions About Bending

[Ablaze]

When I select Bend Clamped, how does the multiple steps of selection work, and what am I supposed to select with each step? I can't seem to find a tutorial that thoroughly explains this.

Also, I'd like to know how to bend out either a segmented line, surface, or a line of vertices, without moving the ends or edges that I want to stay fixed. Like for instance, if I wanted to create the individual bumps in the surface of a car seat, like in this picture.



Or if I wanted to bend out the curvature of a car hood, without disturbing the outer edges: