using( var document = DocX.Load( "Report.docx" ) )

    {

      foreach( var p in document.Paragraphs )

      {

        // Gets the paragraph's charts.

        var charts = p.Charts;

        if( charts.Count > 0 )

        {

          // Gets the first chart's first serie's values (in Y).

          var numbers = charts[ 0 ].Series[ 0 ].Values;

          // Modify the third value from 2 to 6.

          numbers[ 2 ] = "6";

          // Add a new value.

          numbers.Add( "3" );

          // Update the first chart's first serie's values with the new one.

          charts[ 0 ].Series[ 0 ].Values = numbers;

          // Gets the first chart's first serie's categories (in X).

          var categories = charts[ 0 ].Series[ 0 ].Categories;

          // Modify the second category from Canada to Russia.

          categories[ 1 ] = "Russia";

          // Add a new category.

          categories.Add( "Italia" );

          // Update the first chart's first serie's categories with the new one.

          charts[ 0 ].Series[ 0 ].Categories = categories;

          // Modify first chart's first serie's color from Blue to Gold.

          charts[ 0 ].Series[ 0 ].Color = Color.Gold;

          // Remove the legend.

          charts[ 0 ].RemoveLegend();

            

          // Save the changes in the first chart.

          charts[ 0 ].Save();

        }

      }

      // Save the document.

      document.SaveAs( "ModifyChartData.docx" );