AutoCAD Pocket Reference, 2008 Edition

Continue creates a series of dimensions in-line from an existing dimension. If you use the continue dimensioning immediately after a Linear dimension, you do not have to specify the continue extension origin.
Create a linear dimension first (1.400 P1 and P2).
Select the Continue command using the icon or Dimension / Continue. Command: _dimcontinue
Specify a second extension line origin or [Undo/Select]
Specify a second extension line origin or [Undo/Select]
Specify a second extension line origin or [Undo/Select]
