i watched this tutorial https://www.youtube.com/watch?v=Seg5096zmg4
Here Andrew Pricey in Blender render arranging 3 textures. On the top he puts clear snow texture, on the middle he puts painted black and white map or mask of tire tracks, and below he puts ground texture. Then he goes to displacement modifier choosing his black and white map as a texture, and where was white now becomes bumpy, where was black becomes flat.
How to create this in cycles. Let say i have similar two textures snow and grass and painted map. How to go to node editor and arrange nodes?