Input Dialog
The Input dialog enables you to select a generic field as the input to a custom metric. A custom metric is a user-written DataFlux expression as opposed to a predefined DataFlux metric.
To Add a new field: click Add, type the name of the field, click OK, and then click Next to go the Expression dialog.
To change the name of the input field: select the field, click Edit, type the new name of the field, click OK.