Apply height map to an existing surface

I’m looking for the fastest way to create a roughly natural-looking surface on an existing surface (meaning everything matches in terms of levels, but it’s missing some minor roughness for rendering). I thought a height map could be a quick way to do this. But I don’t know if it’s possible to apply it to an existing surface instead of creating a new one. Any idea?

Can you try clicking on the surface and adding your height map to the Displacement property? After it calculates the render mesh you can use ExtractRenderMesh command to turn it into geometry.

Yes. This way is working
Thanks!