Locates a point offset from a reference point within a command.
Toolbar: Object Snap 
Command entry:
At a prompt to locate a point, enter
from Base Point: Specify a point to use as a base point
of <offset>: Enter a relative offset
At a prompt for locating a point, enter from, and then enter a temporary reference or base point from which you can specify an offset to locate the next point. Enter the offset location from this base point as a relative coordinate, or use direct distance entry.
Note: You cannot use this method during dragging in commands such as MOVE and COPY. Specifying an absolute coordinate, either by keyboard entry or with a pointing device, cancels the FROM command.