Re: Help on copper plane
PR0TEL won't let you delete a layer that still has primatives on it. To get rid of all the lines, arcs, strings, etc. on a layer that you want to delete - first deselect everything by doing a hotkey 'X' 'A' (deselect all); now go to the layer you want to get rid of (tab to it on the bottom of the screen); select everything on the layer by doing a hotkey 'S' 'Y' (select all on layer); put your cursor on one of the elements of the layer and do hotkey hold 'shift' and press 'delete'. Now you can delete the layer from your stackup.