Chek wheter a material is child part or not
How to check whether a material is some other materials child part or not & which is that parent material
Go to CS15, specify the material, select Direct click next (arrow indicator pointing to the right), here you specify the plant & tick Multi-level if you want to read multi-level.
The output will show the immediate parent of this material if you want to display single level, but if you have selected multi-level then it will show upto the top most parent.
Hope the above helps.