Selection Region Mode
There are two Selection Region Mode 
options available in the toolbar or Edit
menu to select groups of desired entities, faces, edges or vertices by
drawing a selection region around them using the mouse. Only Geometry Entities can use the face, edge or vertex selection options. To draw a selection region, do the following:
- Hold down left-click and drag the mouse to draw a region.
- Release the left-click when you have finished selection.
- Based on the Selection Mode, the entities, faces, edges and/or vertices that touch the highlighted region will be selected.
The regions can be drawn as the following shapes:
- Rectangle : rectangular shape.
- Lasso
: freehand shape where the start and end points do not need to touch.