TLineSeries *Series;
Series=new TLineSeries(this);
Series->Name = "MySuperSeries";
Series->ParentChart=DBChart1; // Имя DBChar на которую выводить
Series->DataSource = ADODataSet1; // Имя DataSet`а из которого будут тянуться данные
Series->XValues->ValueSource = "X_Val"; // Имена столбцов DataSet`а
Series->YValues->ValueSource = "Y_Val";

// Остальные параметры устанавливай по вкусу...
Series->SeriesColor = clBlue;
Series->Marks->ArrowLength =  8 ;
Series->Marks->Style = smsValue;
Series->Marks->Visible = false;
Series->XLabelsSource = "Val";
Series->Dark3D = false;
Series->Pointer->InflateMargins = true;
Series->Pointer->Style = psRectangle;
Series->Pointer->Visible = false;
Series->XValues->DateTime = true;
Series->XValues->Name = "X";
Series->XValues->Multiplier =  1 ;
Series->XValues->Order = loAscending;
Series->YValues->DateTime = false;
Series->YValues->Name = "Y";
Series->YValues->Multiplier =  1 ;
Series->YValues->Order = loNone;

Series=new TLineSeries(this);