Use the RedefineBasePoint command to set a new insertion base point for all instances of a Block.
Another way to modify the base point of a Block is using the EditBasePoint command in Component editing mode.
Note: For nested Blocks, you can modify only the base point of the parent Block.
To modify the base point of a block:
Rubberband appears between the current base point of the Block and the pointer.
All Block instances in the drawing are updated.
Access
Command: RedefineBasePoint