Civil3D Adding Standard Breaklines

Autodesk Civil3D 2018/ 2019 Autodesk, civil3d, tutorial Civil3D Fundamentals Tutorial - Getting Started How to add polylines as breaklines to TIN surface Excercise file: https://www.dropbox.com/s/1wvffj9yidetscl/Civil3D%20Excercise%20Files.zip?dl=0