Add baseline dimensions to a drawing to measure multiple dimensions from the same point of origin.
Click Annotate tabDimension panel (Aligned) or (Linear).
In the Type Selector, select a baseline dimension style.
In the drawing area, select the first point (origin) for the dimension.
Continue to select the necessary reference points.
When you have reached the last reference point, move the cursor away from the last element, and click.
The baseline dimension displays.
To customize display of the baseline dimension:
In the drawing area, select the dimension.
Click the flip controls () to flip the dimension direction.
Press Spacebar to change the baseline dimension stacking. You can use the spacebar to change the baseline dimension stacking before or after placement.