@jcoon here are the files for the quick example I posted earlier.
Offsets.dwg (601.3 KB)
Offsets.dyn (109.1 KB)
It just uses a line that is already in model space. I 100% agree with Jacob’s perspective - it will probably be easier to do it this way or something similar such as having the user select and move blocks, circles etc. But if you are really wanting to select the points, then you’ll have to tap into the AutoCAD API using a Python script (example here). Note that if you ever decide to run the script with Dynamo Player, then you won’t be able to set this as an input (hence the recommendation to use some type of already-created geometry in model space).
I put together an example of this for you to try out as you start working with Civil 3D objects. Hope it helps!
PoleExample.dwg (3.3 MB)
PoleExample.dyn (81.6 KB)
