Click Insert tab Block Definition panel Block Editor.At the Command prompt, enter BEDIT.
In the Edit Block Definition dialog box, select the block whose grips you want to modify.
In the Block Editor drawing area, select a custom grip (not the standard grip associated with the key point of the parameter).
Do one of the following to reposition the grip:
Drag the grip to another position in the block space.
On the Properties palette, under Geometry, enter values for the Base X and Base Y properties. (These values are relative to the base point of the parameter.)
Click Block Editor tab Open/Save panel Save Block.At the Command prompt, enter BSAVE.
(Optional) If you are finished using the Block Editor, click Close Block Editor.
Block Definition panel 
At the Command prompt, enter BEDIT.
At the Command prompt, enter BSAVE.