After you create port attributes, you can edit the port attribute values for each port in the transformation. To edit the port attribute values, click Custom Transformation on the Ports tab and choose Edit Port Attribute.
You can change the port attribute value for a particular port by clicking the Open button. This opens the Edit Port Attribute Default Value dialog box. Or, you can enter a new value by typing directly in the Value column.
You can filter the ports listed in the Edit Port Level Attributes dialog box by choosing a group from the Select Group field.