Using Components vrs. Groups

Google SketchUp relies on certain attributes to make it the unique and invaluable piece of software that it is! But sometimes, these attributes are a detriment, especially when you're working with objects that are side by side. By placing two objects exactly beside each other, Google SketchUp will automatically detect them as a group.

This means that whenever you move one of the objects, the other object will move along with it. This can be frustrating when you're only wanting to move one of them and not the entire group! This can be easily remedied by making the distinction of one of the objects as a component rather than a group. This will allow you to move one object on its own, and not all of the objects within that group. This tutorial clearly explains the difference of components and groups. So you can get SketchUp working exactly as you need it to!

Source: SketchupTuts