With urban design often areas have to be subtracted from the plan drawing. A collection of such numbers is quiet abstract. The 'Categorize' command is created to put these numbers in categories. The user had to make a selection of closed polylines, circles and/or ellipses. When the selection is confirmed there are several settings which can be adjusted. By default the command will create categories based on the areas of the entities in selection the user made.The command will draw a legend for the categories. Every entry in the legend will be drawn in a layer created by the command, the layer name is based on the category, the layer color is a random color. All selected entities will be hatched by the appropriate layer. When the command is finished there's a legend on the desired position and all selected entities are hatched with a layer which matches the category in the legend. The default settings are created to have a quick start. The user can also define custom categories so the legend shows the information which is desired.