OpenSite Designer... Noob with Surface Generation Questions

Hello everyone,

Longtime AutoCAD user here who this past week decided to give OpenSite a whirl. I am a Microstation/OpenSite Designer noob.

Background:

I already have a working TIN surface generated in Civil 3D and I want to import into or recreate this surface in OpenSite Designer as I want to use the grading automation feature.

Questions:

1) What is the easiest way to do this? A Internet search reveals there is no easy solution. 

2) Within OpenSite, when selecting "Create Terrain from Ascii file" and then Edit Text Import Settings File then the columns tab, I do not see column headings for point # or description. These do exist within the csv file.

Thank you in advance for any help. I know I have a lot of learning so any recommended Bentley Learn training videos are also appreciated.

Tom