Learning Basic Commands to Get Started - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 63

2. Pick a point inside the vertical line on the right, and then pick a point
to the left of this line. The line is offset, creating a new line 0.5 units to
the left (see Figure 2.28).
FiGuRE 2.28 Offsetting the first line of the opening
3. Press ↵ to end the OFFSET command, and then press it again to restart
the command. This will allow you to reset the offset distance.
4. Enter 2 as the new offset distance, and press ↵ .
5. Click the new line, and then pick a point to the left. Press ↵ to end
the Offset command (see Figure 2.29).
FiGuRE 2.29 Offsetting the second line of the opening
You now have two new lines indicating where the opening will be. You can use
these lines to form the opening using the EXTEND and TRIM commands.