How to display a single chart slice without repeating

Question

I have a table called Itenslib. This table I keep the items of a sale. In this table, I made a sum for Profit and Total. The problem is that, for example, the sale with this ID:100030087 it has 5 items and if I chart this sale, I will have the profit share repeated 5 times (same percentage). Then you ask: Isn’t there a table that has the sale itself, stored? Yes there is the table Release, but in this table I have only the total of the sale. For it, according to the customer, I have no way to calculate the profit of this sale. I thought to create a DTO uniting the two tables and bringing only the Total and the Lucrototal, but I haven’t done it yet. Will a DTO in that pattern would resolve? Would I have the chart with a pizza and just a slice? Just for the record, below is my chart using Sfchart

private async void CriaChart()
        {
            SfChart chart = new SfChart();
            DataService dataService = new DataService();

            try
            {
                PieSeries pieSeries = new PieSeries()
                {
                    ItemsSource = await dataService.GetItensLibAsync(IdOrcamento),
                    XBindingPath = "LucroTotal",
                    YBindingPath = "SomaTotal"
                };

                pieSeries.DataMarker = new ChartDataMarker();
                chart.Legend = new ChartLegend();
                chart.Title.Text = "Gráfico da Venda";
                pieSeries.DataMarker.LabelContent = LabelContent.Percentage;
                chart.Series.Add(pieSeries);

                this.Content = chart;

            }
            catch(Exception ex)
            {
                string err = ex.Message;
            }
        }