The following geometric construction interfaces create lines and curves.
Each command supporting the option displays tabs and interfaces appropriate to the command.
Curve by Points on Surface  Creates a curve by interpolation through a set of points. Some points can be designated as knuckles so that the curve has discontinuous tangency. For more information, see Curve by Points on Surface. 

Curve by Two Points on Surface  Creates a curve between two points projected onto a surface. The curve can be created with or without extensions at each end. For more information, see Curve by Two Points on Surface. 

Fillet by Curve  Creates a blended fillet of a specified radius between two curves that are endconnected and projected onto a surface. For more information, see Fillet by Curve. 

Curve by Curves  Creates a single curve from two or more endtoend curves. For more information, see Curve by Curves. 

Curve by Intersection  Creates a curve along the intersection of two surfaces. For more information, see Curve by Intersection. 

Curve at Offset by Intersection  Creates a curve offset from the intersection of a surface or plane with a surface. For more information, see Curve at Offset by Intersection. 

Line from Coordinate System  Creates a line along a coordinate system axis. For more information, see Line from Coordinate System. 

Line by Points  Creates a line between two points. For more information, see Line by Points. 

Parallel Line  Creates a line parallel to another line. For more information, see Parallel Line. 

Line by Point, Angle, and Length  Creates a line at a defined angle and length on a coordinate system plane. For more information, see Line by Point, Angle, and Length. 

Line String by Points  Creates a line string between a series of two or more points. For more information, see Line String by Points. 

Edge from Curve or Surface  Creates a curve at an edge of a surface, such as a plate, the landing curve of a profile, or a solid. For more information, see Edge from Curve or Surface. 

Edges from Curve or Surface  Creates one or more curves at each edge of a surface, such as a plate, the landing curve of a profile, or a solid. For more information, see Edges from Curve or Surface. 

Polyline by One to Four Segments  Creates a polyline string of up to four curves by defining point coordinates on a reference plane. For more information, see Polyline by One to Four Segments. 

Curve as Extended Section  Copies polyline crosssections. For more information, see Curve as Extended Section. 