The best workflow is to create a reality mesh (3SM).
Scalable Terrain Model still exists but 3SM offers greater capabilities.
The good thing is that the workflow is almost the same than using STM.
Open Reality Modelling workflow
Open Attach…
Also, keep an eye on Bentley LastMileUtilities MDL, v2.1 coming soon which includes an alternative method of annotating slope signatures - https://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki/52965/last-mile-utilities…
As another resource, we’ve just added a new playlist on our OpenRoads YouTube channel.
https://youtube.com/playlist?list=PLnJUnxLwu_N7ThhmfkTRw2WShEWT46GCO
Hope that it's helpful.