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You can combine several objects into a group to treat them as a single one. For example, you might group objects laying on a table with the table to in order move them together.
To group objects together, select them by clicking on them while holding down Shift, and choose Arrange > Group (Cmd-G) in the menu.
To ungroup the the objects, select the group and choose Arrange > Ungroup (Cmd-Shift-G) in the menu.
A group of objects is represented in the Project Tree as a single item.
Nested grouping is also supported. You can group either separate objects or a group with another group. When you ungroup the bigger group, objects in a nested group will remain grouped. For example, you can group a lamp with a table. Then group this group together with a chair. After ungrouping the overall group, the table with the lamp will remain grouped and the chair will be separate.
One more command to combine objects is Arrange > Merge into Single Object.
Merged objects become one regular object. Unlike grouping, merging is irreversible. You cannot split merged objects unless you apply Edit > Undo (Cmd-Z).
Merging is effective for objects that contain identical details. For example, a 3D model of a tree can be created by duplicating the same leaf many times. This tree will be rendered faster if you merge its parts rather than group them. Also prefer merging if the objects you wish to combine have the same material applied.
If there is a chance you need to separate objects, or arrange them in different way and combine again, use grouping.