AutoCAD Civil 3D Help | To create a text expression | Autodesk
: Use the MTEXT command to draw a box and type general notes, just like in basic AutoCAD.
: Create the horizontal (Alignment) and vertical (Profile) paths for roads or pipelines.
: Use the Add Labels tool in the Annotate tab. For example, a Pipe Label will automatically update if the pipe's slope or diameter changes.
: For advanced users, use the Expression Editor to create mathematical text formulas, such as calculating a custom elevation offset. 4. Advanced Tools & Extensions