// Init API at first.
Studio api = Studio.GetInstance();

// Open document.
Project project = api.OpenProject(@"d:\MyProject.hxproj");

Variant variant = project.GetVariants()[0];
Designer designer = variant.GetWorkdesks().FirstOrDefault(d => d.Name == "Workdesk_1");
designer.Open(false, false);

// Select cable.
IOccCable cable = designer.GetAllOccurrences().OfType<IOccCable>().FirstOrDefault(c => c.Name == "ca_00002");
// Select its conductive shield.
IOccConductiveShield shield = cable.CableSubParts.OfType<IOccConductiveShield>().FirstOrDefault(s => s.Name == "Shield 1");
// Get shield wire.
IOccShieldWire shieldWire = shield.ShieldWire;
// Select connector.
IOccConnector connector = designer.GetAllOccurrences().OfType<IOccConnector>().FirstOrDefault(c => c.Name == "cn_00001");
// Find matching connected pin.
IPinBase pin1 = connector.Pins.FirstOrDefault(tempPin1 => shieldWire.GetConnectedPins().Any(tempPin2 => tempPin1.ID == tempPin2.ID));
// Select second pin.
IPinBase pin2 = connector.Pins.FirstOrDefault(p => p.Name == "2");
// Reconnect shield wire.
shieldWire.Reconnect(pin1, pin2);

// Save changes and close documents.
designer.Save();
designer.Close();
project.Close();