Multiple Scenes with different Terrain - need help

Hello all i need help :)

Iam new to unity and i have this question:

I have 10 Scenes - Level 1,2,3 .... I want for each one a different Terrain.

I know that this is the way: Select your Terrain game object in your Scene. In the inspector, find your Terrain Collider by clicking on the prefab assigned to "Terrain Data" In the Project folder, left-click on the highlighted Terrain Data prefab that just blinked at you. Press Ctrl-D to Duplicate it. Drag the duplicate into your scene (it will create a new terrain prefab for you) Congratulations! You have a unique terrain you can adjust, paint, edit without affecting the original!

PROBLEM: But now i have two terrains activated in one scene but i only want one terrain on a scene.

Can someone help me :/ ?

Thank you