// Open project.
Project proj;

// Find all display configurations with name "ConfigurationName".
IEnumerable<CableDrawingDisplayConfigurationInfo> displayConfigs = proj.GetCableDrawingDisplayConfigurations().Where(n => n.Name == "ConfigurationName");

// Get found configuration
CableDrawingDisplayConfigurationInfo foundDisplayConfiguration = displayConfigs.FirstOrDefault();
if (foundDisplayConfiguration == null)
{
	// display configuration not found.
}

// Get a variant.
Variant variant = ...

// Get cable units for derivation.
IEnumerable <CableUnitInfo>cableUnitsForDerivation = ...

// Derive a new Cable Drawing.
variant.CreateCableDrawing("New nailboard name", cableUnitsForDerivation, foundDisplayConfiguration);

// Save and close the project.
project.Save();
project.Close();