In DAZ Studio I can save Material presets and only save my opacity channels and I will have a mat file that only alters the transparency in my clothes so an item can look ragged with the new transmap.  How can I do this in Poser?  I have Poser Pro (not 2010) and when I create Mat files in the Material room I don't think I have the option to exclude all the other channels but opacity when saving a material file.