To create a horizontal or vertical dimension

  1. Do one of the following:
  2. Press Enter, and then select the entity to dimension.
  3. Or, you can insert the dimension by specifying the first and second extension line origins.
  4. Specify the dimension line location.

 

 

To insert a linear dimension by selecting the entity, select the entity (A) to dimension, and then specify the dimension line location (B).

Result.

 

 

To insert a linear dimension by selecting the extension line origins, select the first extension origin (A), select the second extension origin (B), and then specify the dimension line location (C).

Result.