I am trying to figure out how can I override material on instance. However there is tricky part, instance is imported .obj, with lot of groups. Now I need to override material that is applied only on one group, and keep rest intact. Is this possible?

On second search I found my answer here http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=25840. [sidefx.com]