A Projected Curve.1 object belonging to
Geometry Specifications.1 appears in the specification
tree under the Surface Mesh.1 mesh part.

The selected curves are now yellow-highlighted and
the points at the intersection of constrained curves are
red-highlighted. They are constrained.

If the projected curve encounters boundary
edges (for example the edge of a hole), the projected curve
is going through the boundary edges.
In the following example, the red line is selected to be projected.

The resulting projected curve is split into three curves:
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