GALENA allows you to define geology or slope makeup as it exists or will exist, without first defining the slope surface, thus providing for rapid assessment of design options.
What this means is that the slope surface is entirely independent of the material profiles (profiles define geology or material layers), and can be moved, modified or re-positioned without changing, moving or re-defining any of the material profiles.
This unique feature also means that you save time by not having to re-define or change your material layers every time you want to change the slope surface, which is the way it should be...
...Stability analysis shouldn't be an uphill battle!
We should emphasis that it is not necessary for the user to remove or strip away any of the profiles or materials that lie above the slope surface when modelling in this way, at any time - that is handled entirely and automatically by GALENA.
This capability led one well-respected observer to candidly comment "I can see why GALENA walks over everything else available to the mining industry".