I have handles on the center section of the WSM. If I need to add charcoal (I use lump) I take the center section off and set it to the side. Then, I push all the remaining lit charcoal into a pile on one side, and add new lump so that the pile of unlit is next to, and partially over top of, the lit. (This is like the way I start my fire to begin with: a small pile of burning lump at one side of a full ring of charcoal.) Then I just set the center section back on and let the fire do its thing.