Channels can be placed into groups. Channel groups make it easier to use the channel table and workspace when you have many channels, but have no affect on addressing the channels in expressions. By default, all channels are in the main group. The channel table displays tabs above the table for selecting the group. At the very right is a button labeled New Group that can be used to create a new group. Once you have multiple groups, a new tab labeled All will also appear. This tab lists all channels irrespective of group. There is also a column in the channel table labeled Group. You can use this column to quickly change the group of a channel and even create new groups by entering in new group names here.
Channel groups can be used inside the Channel.ListAll() and the Channel.ReadGroup() function to list or read channels from just one group.