How do you make a transform dissappear from game view on command and reappear when needed?

Transforms aren't visible in the first place. You could make your meshes not be drawn by using Renderer.enable, you can make your objects non-active by using GameObject.active, or you can destroy an object and then re-instantiate a prefab in its place. It depends on why you want it to disappear, and under what conditions it should reappear...