Nooby question about Bryce High Resolution Terrains

I was thinking of buying one or a few of these and using them as a base environment for my scenes. My question is how hard it is to 'improve' the landscapes in the areas I want to build up. I just want to edit the mesh in spots to make the ground level. Is this something I could do in Blender? It's the only thing I have other than DAZ.
Thanks!
Comments
You would need Bryce to use them.
Yes, as Mike says, this is a Bryce specific item, and the High res terrains are large, and as the title states, High Resolution terrains generated specifically, at planetary resolution, with Bryce textures also formulated specifically for them in the Bryce DTE. They come complete with Bryce Camera set-ups and HDRI to aid their use in Bryce.