To create a group in Extreme Management Center:
1. Select the Device tab.
2. Select User Device Group from the pull down.
3. Right click on My Network and select Device Groups > Create Device Group.
4. Provide a name for the group and click OK.
To add ports to that group:
1. Select the Device View of a switch.
2. Expand the ports.
3. Select the ports that you want to add.
4. Right click and select Add to Device Group.
5. Select the port group that you created above.