Creating your own tree controller?

[CasperVg]

Can anyone explain me how to do this? I have tryed copy-n-paste the trees i wanted from existant controllers, but that didn't really work out (no trees appeared at ground level). I'm trying to create a controller that creates subalpine firs for medium and high elevations, and CP elms, valley oaks, scarlet oaks, cottonwoods, rhodendon, oaks, aspen & bushes for lower elevations.

Thanks,
CasperVg

[wouanagaine]

Cycledogg explained me on day, I want to add rocks and remove some trees, but I never get very far

I hope he'll see your request