basic it will snap to the black lines to the box, then a new window popup with extra options to use from there! you can do more! select a plant's or people even, then type in the number of items you like to be inside that box.
as Mstenger404 stated above follow it you be great, happy mapping
really come in handly if your not going to have a lot of buildens on the map.
remember keep holding the Ctri-key down as you do this when it release the mouse. you get that option as Mstenger404 stated above
