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Groups or components have always had qualities, or attributes associated with them.
They have a position.
They have size in three dimensions.
And a rotation may be applied.
If you have used SketchUp, you have been editing and working with these attributes... just visually.
With the Pro version of SketchUp 7...
... you now have the ability to edit and work with these attributes and their values...
... in the Component Attributes dialog.
Your attribute values can be simply adjusted with numbers...
... or you can use formulas to make your components truely dynamic.