Groups
Several objects can be grouped together. Select two or more objects and use the Arrange ‣ Group menu command to turn them into a group. A group behaves like a single object; you can select it, move it around, resize it, use inspectors to change its style and properties, connect lines to it, and so on. Any object can be grouped, even a group.
Click once to select the group as a whole, then click again to select an individual member of the group. You can keep clicking to select members of groups within groups.
To take apart a group, select it and use the Arrange ‣ Ungroup command.