I have not been on here in ages, and have not been working in VIZ much either. But I recently bought a package of cars, and today went to use one and found that a few objects in the file are grouped together, and some of them are incorrectly grouped. I need to find out how to fix this problem, either by ungrouping them, or assigning a material just to one piece of the group. I am not familiar with how to do this in VIZ, any advice or help would be great.
I am attaching a screenshot, to show the problem. There is one body panel of the car, is grouped with some other parts, and the one body panel is the original color, and I want to change it. I am just stuck, it is over my head, so I turned here for help.

TIA.