Arranging : Clip Loops and Groups : Regrouping Clips

Regrouping Clips
The Regroup menu command undoes the last Ungroup command and regroups all the individual clips as a clip group. This lets you ungroup a grouped clip, edit its underlying clips, and regroup it to continue working on higher-level composition and arranging.
To regroup a clip group:
1 Select any clip from the ungrouped clip group.
2 Choose Clip > Regroup.
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Press Control+Alt+R (Windows) or Command+Option+R (Mac) to regroup selected clips that were formally part of a clip group.
If you used the Ungroup All command, the Regroup command recreates all previous nested clip groups.
3 If you regrouped an ungrouped clip group that was used more than once in the session, do one of the following when the Change All dialog opens.
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Choose Modify to apply your changes to all other instances of the same clip group.
– or – 
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Choose Copy to create a copy and apply your changes only to the copied clip group.