You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Menu+Structure

You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Tools+Mapped+to+Menus

Workplane Intersections Snap

 
Snaps to intersection curves between 3D objects and the current workplane. (For information on workplanes, see Workplanes)

  1. The workplane must be displayed (see Displaying the Workplane), and intersection lines must be displayed as well (see Display Intersections with 3D Objects).
  2. Activate the Workplane Intersections snap along with the snaps you want to use on the intersection lines and curves. In this case Vertex snap is active, and you can snap to an endpoint of the intersection line.