Add a nested decision node to check traffic from search referrers by following specific steps.

1. Select the Advanced segment title.
2. Drag the Referrer decision node to the rules canvas.
3. Enter google in the Value text box.
4. Select the plus (+) icon in the top right of the Request Header dialog box. The Add Decision dialog box displays.
5. Select the Referrer decision node. A tab is added to your Request Header dialog box.
6. Enter bing in the Value text box.
7. Select the Or radio button from the Type options. You can add further tabs for each search referrer you want to check, as described above.
8. Select the Save button. The nested decision node is added to your rules canvas.

   Now you can add the Outcomes to your Sub Rule, as described in the Add Outcomes to Your Sub Rule topic.