When you group objects together, you can select, move, rotate, and scale the group as a single unit.
Press Ctrl + G to group objects together
| To... | Do this |
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Group selected objects together. |
Select or press Ctrl + G. See Group Options for more information. |
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Ungroup selected group. |
Select . See Ungroup Options for more information. |
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Select object inside a group. |
Open the Outliner and expand the group node to show the objects inside the group, then click the object you want to select.  |
In terms of the scene hierarchy, the Group command moves the selected objects under a new transformation node.