To Add a Secondary Leader to a Feature Control Frame Symbol (AutoCAD Mechanical Toolset)
In the drawing area, double-click the feature control frame symbol to edit.
Click the Leader and Text tab.
Click Add.
Select an object to attach the secondary leader to.
If you attached the leader to a line, in the drawing area, specify the start point.
If you attached the object to an arc, circle, ellipse or spline, skip to the next step.
Specify one or more points to define the vertices of the leader, and then click the Feature Control Frame symbol.
Note:AutoCAD Mechanical toolset forces the first leader segment to be perpendicular to the attached object and all subsequent sections to be horizontal or vertical. To override this restriction, press the Toggle Symbol Leader Orthogonal Mode key (SHIFT + F, by default) as you drag the crosshairs.