Create a Custom Coordinate System
How to Create a Custom Coordinate System Step By Step
Craig Batchelor of ImaginiT covers how to create a new coordinate system for use with Civil 3D Survey
Craig covers how to find and use the Map3D Coordinate Creation Wizard from the Map3D interface and how to set the coordinate system as the default for your drawings.
From the ImaginiT Technologies YouTube Channel
Sadly, Craig is not the most exciting presentor and the topic is a tough one.
However, all the necessary content is in there and delivered in good detail.