1) Create lines between two points : Select two points

2)Create lines based on a point and direction : Select a point and a line ,then specify the start and end point of the line.

3)Create lines at an angle or normal to a curve : Select a curve and its support, a point on the curve,then speify the angle value ,the start and end points of the line.

4)create lines tangent to a curve : Select a curve and reference point,then specify the start and end point of the line.

5)Create lines normal to a surface : Select a surface and refrence point,then specify the start and end ponits of the line.

6)Create lines normal to a surface : Select a surface and a reference point ,then specify the start and end points of the line.