By setting the device, you can set the port name etc in the port list automatically.

Please select "Edit" from the context menu at the object you want to edit.
 

 
Set device.
 

 
The port name set in the device is set in the port list. 
If you want to change the port name of the device, change it in the port list and press the "Update device" button.
 

 
You can change the device setting with the menu.