How to clip block, Xref, image or viewport?
CAD system has different clip commands for different objects: to clip image, the command is IMAGECLIP; to clip viewport, the command is VPCLIP; to clip block and Xref, the command is XCLIP.
In higher version of CAD system, the CLIP command replaces XCLIP, IMAGECLIP, VPCLIP, etc. It crops a block, Xref, image, viewport and underlay (PDF or DGN) to a specified boundary.
XCLIP
The XCLIP command is used to clip selected external reference or block reference by clipping its specified boundary.
How to access XCLIP:
Menu: Modify > Clip > XCLIP, as shown in the following picture,

Command: XCLIP, as shown in the following picture,

IMAGECLIP
The IMAGECLIP command is used to clip a selected image by specified boundary.
How to access IMAGECLIP
Menu: Modify > Clip > Image, as shown in the following picture,

Command: IMAGECLIP, as shown in the following picture,

VPCLIP
The VPCLIP command is used to clip the object in layout viewport and adjust the viewport frame shape.
How to access VPCLIP
Menu: Modify > Clip < Viewport, as shown in the following picture,

Command: VPCLIP, as shown in the following picture,

Sometimes we need create irregular viewport in the layout space, such as L or circle, we can clip with specified boundary.
For example, open a drawing with graphics objects, them switch to layout space, draw a circle as the clip boundary, as shown in the following picture,

The command line will give the following prompts:
“Select clipping object or [Polygonal ]<Polygonal>”
“Specify start point”
CLIP
In higher version of CAD system, the new CLIP command is a combination of the above commands and the XCLIP, IMAGECLIP and VPCLIP remain. So if your CAD system supports CLIP command, remembering only CLIP command will do.

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