1. Click View tabCoordinates panelOrigin. Find
2. At the Specify New Origin Point prompt, specify an origin point.

   The origin point specified is used to define the value assigned to the ordinate dimension.
   Typically, the origin point is defined on the model.

3. Click Home tabAnnotation panelOrdinate. Find
4. If straight ordinate leaders are required, turn Ortho mode on.
5. At the Select Feature Location prompt, specify a point location.
6. Enter x (X Datum) or y (Y Datum).

   You can skip this step by making sure that the ordinate leader endpoint is close to
   vertical for an X datum or close to horizontal for a Y datum.

7. Specify the ordinate leader endpoint.

Learning AutoCad