Developing Drawing Strategies: Part 1 - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 151

FiGuRE 4.66 The offset vertical lines between the jambs
11. Hold the cursor out directly to the right of the point you just selected
to draw a horizontal line through the three vertical lines.
When the cursor is about 2 ′ to the right of the three vertical lines,
pick a point to set the endpoint of this guideline (see Figure 4.67). Press
↵ to end the LINE command. Click Ortho mode off (gray background).
FiGuRE 4.67 The horizontal guideline drawn through vertical lines