Hello-
Since you have your section views already created and you have created your Section View Label Set that specifies the new Corridor Points style label you created (per the video).
To get your section views to update, you need to run a command that will convert the default Code Set Style Labels to the new corridor Points Style Label. Type: CORRIDORSECTIONLABELSCONV
TYPE: ALL
SPECIFY: CORRIDOR POINTS STYLE LABELS
You will notice all your current labels in your section views will disappear. Just select one of the Section Views and right click and chose Section View Group Properties. Then Under the sections tab, add new corridor points label set to your corridor.
Please watch workflow below:

Jeff's video I sent earlier discusses this important step at 6min 17 seconds...
I would also re-watch it to make sure your .dwt is set up correctly the next time you create multiple section views...there are command settings that were not set in the 2017 file you sent. Again this is only applicable for new section view creation.
Michael M. Carlson
Senior Civil Designer
CADD Manager
AutoCAD Civil 3D Professional
AutoCAD Professional
