The View Parts feature will isolate each selected Group/Component and assign it to its own SketchUp Scene for viewing. All other parts of the model will be hidden.
Use Case: This tool can be helpful if you wanted to take something that is made of individual pieces (furniture, construction detail, etc) and view each part separately. If you bring the whole assembly model into LayOut, you can break out each piece for individual dimensioning/detailing.
How to Use: It's pretty straight forward..... Step 1) Select all the Groups and Components you wish to view separately. Step 2) Go to Plugins > View Parts ... and follow the dialogs.
I hope this helps