Flatten one small area

[djanim8]

I'm new to Gaia 2021 and am trying to figure out how to flatten just one small area of the terrain. I need an object to sit flat on it and I can't figure out how to make it flat.  Any help is appreciated!

Thanks!

[Bryan]

You could use the stamper and set the operation to lower. Then put a distance mask on stamper. 

 

Additionally you could just click on the terrain and go to paint terrain and set it to set height and then just paint on the terrain. 

 

Either way should work.