I have made my retopology model and transfer the sculpting details trough a normal map node and now I want to add materials to my new low poly mesh. My fear is that if I move or change the previous unwrap to create the final material for my mesh the previous baked normal map material will get distorted.

So my question is how do I add material to my new low poly mesh (with normal map included) if there is an active normal map already?

Is there a way to permanently bake the details obtained to a normal map material node so that I can continue working on textures?

Thanks in advance.