See the section Polyline to know how to create a polyline manually.
In the Extract menu, you can use some other tools that are not detailed in this Guide, but you can refer to the Help files:
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Join 2 Polylines: to compute a curve to link the extremities of two polylines
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Extract All Holes and Borders: to extract the lines of the free contours and the holes in a mesh
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External Contour: to compute the external contour of a mesh seen from a specific direction
Several other tools are available in the software to extract and manage polylines. They are situated in the menu Extract:
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Intersection: to compute various intersections, between polylines, meshes and geometric shapes
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Projection: to compute various projections, such as a point or a polyline on a plane or on a mesh