Use the FDOT Create/Edit Application to create the DSGNRD##.DWG file.
Open the drawing and reference the necessary information.
Reference the Existing Ground:
Below Data Shortcuts in the Prospector Toolspace > expand Surfaces > right-click the Existing Surface > select Create Reference
Specify the desired surface style.
Reference the Alignment:
Below Data Shortcuts in the Prospector Toolspace > expand Alignments > right-click the Alignment > select Create Reference
Specify the desired alignment styles.
Reference the Profile:
Below Data Shortcuts in the Prospector Toolspace > expand Alignments > expand the Alignment associated with the profile > right-click the Profile > select Create Reference
Specify the desired profile styles.
AutoCAD Civil 3D 2012 User's Guide reference: User's Guide - Corridor Modeling - Assemblies and Subassemblies - Creating Assemblies