Layers

Keyboard shortcut	Function
Command-Shift-N	Create a group.
Command-Right Bracket (])	Bring the object to the top of the group.
Command-Left Bracket ([)	Send the object to the bottom of the group.
Command-Right Bracket (])	Bring the object up one level in the Layers list.
Command-Left Bracket ([)	Send the object down one level in the Layers list.
Command-Shift-G	Place the selected objects in a new group.
Command-Option-G	Ungroup a group of objects so you can manipulate each object.
Control-T	Make the object active or deactivate the object.
Control-S	Enable/disable the Solo button of a selected track.
Control-I	Isolate the selected group or layer.
Control-L	Lock/unlock an object.
Up Arrow	Move up one level in the Layers list.
Down Arrow	Move down one level in the Layers list.
Option-Left Arrow	Expand a group in the Layers list.
Option-Right Arrow	Collapse a group in the Layers list.
Command-I	Import.
Command-Shift-M	Add an image mask to the selected object.
Command-K	Convert the applied behaviors to keyframes.
Shift-F	Open the Media list and Inspector to reveal the source and properties of media objects.
K	Clone the selected layer.