Make this feature a good friend. A clip group is a collection of any combination of audio and MIDI regions that looks and acts like a single clip. Clip groups can be created on single or multiple adjacent audio, MIDI, and instrument tracks and can be considered like ‘containers’ and as such can be manipulated just like any other ‘normal’ clip. Some edits will affect all the clip in a group where as others only apply to the boundaries of a clip group like Trim.
Clip groups are very useful for ‘temporarily consolidating’ a bunch of clips that might have been created by the use of Beat Detective or grouping parts or sections together like a brass section and copying it from one chorus to the next. Although you could use Consolidate Selection the benefits of Clip Grouping are that you can ungroup them and get back to the individual clips and it works across multiple tracks, neither of which you can do with Consolidate Selection.
Russ has done an excellent video on how to use Clip Groups.