You can construct a line perpendicular to the first input feature and passing through the centroid of the second input feature.
To construct a perpendicular line:
Open the Construct Line dialog box (Insert | Feature | Constructed | Line).
From the Method list, select the Perpendicular option.
From the Feature list, select two features of any type.
If you want to change the feature theoretical values, select the Feature theoreticals check box and type in the values. For details, see the "Specifying Feature Theoreticals" topic in the PC-DMIS Core documentation.
Click the Create button.
The Edit window command line for this option would read:
CONSTR/LINE,PRTO,feat_1,feat_2,length
A - Line constructed perpendicular
to the first feature and through the center of the second feature
B - First feature
C - Second feature
D - FRONT
Constructing a Perpendicular Line