Using Surfaces and Curves

	Join Surfaces or Curves: select at least two curves or surfaces to be joined.
	Extrapolate Surfaces: select a surface boundary, specify the extrapolation type and value.
	Extract Geometry: select an edge or the face of a geometric element, and set the propagation type.
	Create Intersections: select the two elements to be intersected.
	Create Projections: select the element to be projected and its support, specify the projection direction.
	Create Boundary Curves: select a surface's edge, set the propagation type, and re-define the curve limits if needed.