Possible to add assets to specific area only?

Is there a way to for example paint some area of the terrain and then use only that painted area to place trees, stones, or some other assets?

The issue happens when trees are placed on roads or other things, and it’s tedious to manually delete them one by one.

I am just a beginner regarding unity so my question is perhaps off the point or in the wrong place so sorry about that.

Would appreciate any help, or some redirection to links regarding my issue. Thanks a lot!

Hey, you can create a Terrain and in the “Paint Trees” set your trees, bush, rocks for paint or remove. When you sculpt this terrain your actives will be updated position