User Help > Displaying Item Data Graphically > Creating a Chart > Item Fields Trend Chart: Add Expression or Edit Expression Dialog Box
  
Item Fields Trend Chart: Add Expression or Edit Expression Dialog Box
The Add Expression dialog box allows you to create the details of a numeric field reported on in an item fields trend chart. The Edit Expression dialog box allows you to edit the details of such a numeric field.
1. From the Numeric Field list, select the numeric field you want to report on.
2. In the Expression Label field, type a name for the numeric field as you want it to display in the chart.
3. In the Display Pattern field, select or type a display pattern for the value of the numeric field.
4. In the Axis Label field, do one of the following:
If your chart contains one numeric field, type a name for the numeric axis as you want it to display in the chart.
If you chart contains multiple numeric fields and you want to specify the same axis label for all numeric fields, type a name for the numeric axis as you want it to display in the chart, or select an existing axis label from list.
If your chart contains multiple numeric fields and you want to specify an axis label for each numeric field, type a name for the numeric axis as you want it to display in the chart.
5. To add the numeric field to the chart, click OK.