Defines another geometry representation of a master block in the active document. Use this command to create unique configurations or views of an object within the same block. The master block under which the view is created is set automatically to be the default block. It appears in boldface in the Block Selection Pane.
To select another block as the basis for a new block view, first place the block in the drawing, then select the Unblock command to make the graphics selectable.
To read about using a .dft, .dxf, or .dwg file as the source of block view geometry, see the Help topic, Using Blocks.