Multiple models and layers for one object

Hi, I want an object (a car) to have to models associated with it and have one (the car) in the normal layer and the other (a large sphere) to go in a different layer(MiniMap icons). Is this possible or do I need to parent one to the other?

Did you want to know if you can have a child object that is assigned a different Layer value?

If I'm not mistaken, Unity asks you if you want to apply a "Layer" change to only the Parent object or to include its Children as well. So yes, I believe what you're trying to ask is possible.