I just started to work with TBC few months ago. I have a question accordin the work with corridors and volume calculations. I have a problem to separate the volume for cut in soil and cut in rock. Int he BC-HCE there was a command for defining strata there you could define a surface for rock and another for soil but I can not find something simmilar in TBC. Is there some other way how You can get your cut volumes separated between soil and rock automatically.