Hi-
Corridor Feature line visibility and styling is controlled by the code set style for the corridor points that are assigned to your subassemblies.
The option “add as breaklines” is really meant for corridor surface builds where you add certain corridor point Feature Lines to the surface build. I could be corrected here, but I don’t believe specifying the Top or Datum links as breaklines does anything to improve the surface definition. I say this because when you add Top links for example, the corridor surface is built from each assembly insertion either way.
I hope this helps.
Michael M. Carlson
Senior Civil Designer
CADD Manager
AutoCAD Civil 3D Professional
AutoCAD Professional
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