You can delete a user-defined security group.
- From the top navigation bar, select Resources and click Cloud Resources.
- In the left panel, click Organization VDCs.
- Click the radio button next to the target organization virtual data center, and click Manage Firewall.
- Click the tab.
- Select the security group you want to delete.
- Click the Delete button.
- To confirm the deletion, click OK.
The security group is deleted.