Siemens CL-110-I - Manual (Page 110)

Group Name:
Type in a name here as a group name. It
must be unique. The word length must not be
over the length of the field.
Available Interfaces:
The available interfaces (such as Ethernet,
USB etc.) will be displayed in the left side
box. When you choose it and click Add, it
will be transferred into the right side box of
Grouped Interfaces. Yet, if you want to
remove the interface from the current group,
it will be returned back to the Default group
(left side box) after you click Remove.
After finish the settings, click Apply.