1, open a plane example drawing, and then define the whole diagram into blocks, shortcut key (B).
2, in the need to intercept the place, as needed to draw a rectangle. The size of the rectangle is the range that will be displayed when the time comes.
3, select the plane block, press XC command space. Default new boundary, space.
4, prompted by the type of boundary, select Rectangle, because it has been selected before, so, now direct rectangle can be, after the choice of space.