Settle3D > Material Properties
In Settle3D version 1.0, it is assumed that all soil layers are horizontal and continuous.
To define the material properties and layering of your model:
Define the material properties in the Soil Properties dialog.
Define the sequence of soil layers in the Soil Layers dialog.
See the above links for more information.
NOTE: it is expected that future versions of the program will allow non-horizontal soil layers and more generalized soil geometry.