Offset allows you to quickly offset (or INset... if that is a real
thing) selected edges. Learn all about this commands, it's modifiers,
and a shortcut or two in this video.
Sketchup for iPad is included with SketchUp Go!, SketchUp Pro and Sketchup Studio for Students/Educators. You can find many more SketchUp instructional videos on the SketchUp YouTube channel
