A proximity breakline does not add new points to a surface. Instead, the nearest surface point to each breakline endpoint is used. The triangles that make up a surface are then recomputed making sure those points are connected. A proximity breakline is created using the same fashion as standard breaklines except you call AeccSurfaceBreaklines.AddProximityBreakline instead of AeccSurfaceBreaklines.AddStandardBreakline.

Set oBreakline = oTinSurface.Breaklines.AddProximityBreakline( _
  oEntityArray, _
  "Sample Proximity Break", _
  1#)

AutoCAD Civil 3D

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Adding a Proximity Breakline

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