Add Widenings to Offset Alignments
Jeff Bartels of Autodesk explains the fundamental basics of Offset Alignments and Widenings in Civil 3D.
From the Jeff Bartels YouTube Channel.
and the Civil Immersion blog.
Best to always remember that when you create Offset Alignments you can also create slope-controlled Offset Profiles (or not) in recent releases of Civil 3D.
Your Alignment naming convention and Name Template Rules get to be pretty important if you employ lots of Offset Alignments and Offset Profiles.