Subobject manipulation

- [Instructor] Right now, this stair is open…on this side, so that you could actually…fall off of the stair, and it would…present somewhat of a hazard.…And so, now, we need to build a low wall.…And we have a representation here in the plan…where that wall would go.…So, let's start by creating a new layer…and call it - Wall - Low.…And I'll set that as the current layer.…I'll also change it's color.…Let's make it a dark red.…And then, I'd like to draw a rectangle…on the ground, but right now, the UCS is set…so that the XY plane is parallel to this red wall, here.…

So, I need to reset the UCS back to the original…coordinate system called, the World System.…To do that I'll type USC, Enter, Enter.…So now, the XY plane is on the ground.…I'll go ahead and draw a rectangle…going from this corner over to…this opposite corner, right here.…And then, I'll extrude the last object…that was created by typing L, Enter, Enter.…

Exit from selection mode.…And now, I'm into the extrusion process.…So, I'm going to extrude this all the way up to the top…