Is there way to delete uv's from the texture editor and start fresh again? The thing is I map out my uv and then I added/combine the head to mesh: it messed up the layout of the uv editor. it looks like a spider web
In this case, you can just select the shells of the already mapped areas and move them off to the side while you map the rest of the faces. Then arrange all the UV shells to your liking, no need to redo projections.
You can also manage multiple uv sets inside of the uv set editor for organization. At the end you can then merge the sets for the final layout. Ninja UV also provides buttons for moving shells. Is on creative crash and worth the 20 bucks.