In Toolspace, on the Prospector tab, expand the surface Definition collection, right-click , and click Add.
In the Add Breaklines dialog box, enter the breakline description in the Description field.
Select Standard from the Type list.
Optionally, if the object from which you are creating a breakline has curves, enter a value into the Mid-Ordinate Distance field or to select a distance in the drawing area.
The Add Breaklines dialog box closes and you are prompted to select an object.
Select the object to define the breakline.
The breakline is created and added to the surface Breaklines collection item in the Prospector tree.