The BaselineCollection class allows you to add a new Baseline to a Corridor using the Add() method. There are two versions of this method. One takes the name of the new Baseline, the ObjectId of the Alignment, and the ObjectId of a Profile. The second takes the name of the new Baseline, the name of the Alignment, and the name of a Profile.
In this example, a corridor is selected by name, and the first alignment in the document and the first profile in the alignment are used to create a baseline.
// use on a document with at least one alignment, and one profile for the alignment // EG: Corridor-5b.dwg in the tutorials directory string corridorName = "Corridor - (1)"; Corridor corridor = ts.GetObject(_civildoc.CorridorCollection[corridorName], OpenMode.ForWrite) as Corridor; // Get the ObjectId of an alignment and profile ObjectId alignmentId = _civildoc.GetAlignmentIds()[0]; Alignment alignment = ts.GetObject(alignmentId, OpenMode.ForRead) as Alignment; ObjectId profileId = alignment.GetProfileIds()[0]; Baseline baseline = corridor.Baselines.Add("New Baseline", alignmentId, profileId);