Use the Competitor value in the Category field to classify your Address Book entries as competitors.
- Click on the Address Book entry to make it the current entry.
- In the following pane; select the Details tab and click Edit.
- If necessary; from the Key Fields for drop-down list; select a Key Fields list that contains the Category field.
- By default; the Category field is included in the list.
- From the Category drop-down list; select Competitor.
- Click Save.