i have had limited success by making the rough outline of the slope with the Raise option and then using Pathen, not Level to make it slope
then you can add grass, trees, etc to hide the ugliest parts, but it will never look truly natural

I think there is something like hold shift and middle mouse or something? That is "supposed" to give you a nice slope.

I just make stilt houses and use steps ha ha.

Oh its holding shift and left click.

Shift-left click to level seems to work great! Thanks a lot!

Cheers!