On

Displays the clipped portion of the external reference or block in the current drawing.

Off

Displays all of the geometry of the external reference or block in the current drawing,
ignoring the clipping boundary.

Clipdepth

Sets the front and back clipping planes on an xref or block. Objects outside the volume
defined by the boundary and the specified depth are not displayed. Regardless of the
current UCS, the clip depth is applied parallel to the clipping boundary.

Front Clip Point

Creates a clipping plane passing through and perpendicular to the clipping boundary.

Distance

Creates a clipping plane the specified distance from and parallel to the clipping
boundary.

Remove

Removes both the front and back clipping planes.

Delete

Removes a clipping boundary for the selected xref or block. To temporarily turn off
a clipping boundary, use the Off option. Delete erases the clipping boundary and the
clipdepth. The ERASE command cannot be used to delete clipping boundaries.

Generate Polyline

Automatically draws a polyline coincident with the clipping boundary. The polyline
assumes the current layer, linetype, lineweight, and color settings. Use this option
when you want to modify the current clipping boundary using PEDIT and then redefine
the clipping boundary with the new polyline. To see the entire xref while redefining
the boundary, use the Off option.

New Boundary

Defines a rectangular or polygonal clipping boundary, or generates a polygonal clipping
boundary from a polyline.

Select Polyline

Defines the boundary with the selected polyline. The polyline can be open but must
consist of straight line segments and cannot intersect itself.

Polygonal

Defines a polygonal clipping boundary with three or more points that you specify for
the vertices of a polygon.

Rectangular

Defines a rectangular boundary with the points that you specify for opposite corners.

Invert Clip

Inverts the mode of the clipping boundary: objects are clipped either outside the
boundary or inside the boundary.