Thank you for the response!

Here is how I am creating proxies, let me know if there is a better way to be doing it...
1.Download model from sketchup warehouse, lets say a person.
2.Select the Person, and click export vray proxy.
3.The Export proxy dialogue appears. I click "Export a single vrmesh file", "automatically create proxy", and "warn for existing files".
4. Set a number for the preview mesh and click "OK"
5. It saves a vrmesh file (with no material applied) as well as a sketchup file with the proxy.
6. In the sketchup file, all the different materials that make up the proxy are in the material editor as well as a multi ID material. The multi ID material is just a list of all the materials within the proxy.

Is there a way to put the multi ID material on a render channel or Do I have to individually put each material within the proxy on a common render channel? Or is there a way to create the proxy that will merge all the materials into a single material?

I was hoping someone had a good way to apply render channels to proxies. I have made a few proxies of people and trees. Is there a way to create a render channel that isolates just people, or just trees etc.? This can be done in 3ds MAX by apply a render channel to objects themselves. Anyone know if this can be done in sketchup?

Thanks!

-Dan