Slope creation in PFC

I want to create a slope as we do in 3DEC, but I do not understand how to do it in PFC.
Also, I have imported geometry in a STL format file and am getting confused about how to proceed forward.
Please let me know, or can anyone share a small snippet of code?

Hello @ShivamPandey,
Typically slopes in 3DEC are comprised of blocks representing the material of the slope. In PFC this is not practical due to the number of particles you would need to represent the slope.

You can import a slope as a wall object which particles can interact with. See wall import command that allows you to import wall directly from geometry objects (or .dxf and .stl files).

thanks for the response now I am trying to import but there is problem in geometery or other i am not understanding. Can you tell me what is the problem.
Object drive link

Thank you for the suggestion, and I have done it successfully. Now I want to create a ball in geometry and to some extent I have succeded. Can you suggest how I can do it in a triangle shape, as shown in the figure?