In most cases an AutoCAD file starts with a drawing of the existing situation. The ways those drawings are setup are as diverse as the projects themselves so information can come in many forms. The position of trees for instance. It can be marked in many different ways. In a drawing it is common however to use blocks for trees. AutoCAD commands can tap into the drawing database and take the required information from the provided entities and place a block based on that information. With these tools you can turn an inventory easily in a proper plan drawing.