Sketcher > Dimensioning Sketcher Geometry > Working with Dimension Tools > Baseline and Ordinate Dimensions > To Create Ordinate Dimensions
  
To Create Ordinate Dimensions
1. Establish the baseline by clicking Sketch > Baseline.
2. Select the geometry to dimension as a baseline and then middle-click to place the dimension.
For lines, the baseline is oriented the same way. For arc and circle centers, and for geometry endpoints, choose one of the following options from the Dim Orientation menu:
Vert—Orient the baseline vertically.
Horiz—Orient the baseline horizontally.
3. To create ordinate dimensions to the specified baseline, click Sketch > Normal.
4. Select the baseline dimension and then select one or more entities. Middle-click to place the dimensions.