At times you may need to combine multiple parts into one, or remove sections from a solid. AutoCAD has some commands that make this easy for you. AutoCAD File Formats Go here to get information on AutoCAD's various file formats. It is very common in AutoCAD to change the properties of an object after you have created it. An example would be offsetting a line and then changing it to a different layer.
Every object has properties.
Some are common to all objects, such as layer, linetype and color. Other object has very specific properties such as text or blocks. Since there are many types of objects, there are also many ways of modifying their properties. In this lesson you will be introduced to blocks. It Defining Attributes in AutoCAD AutoCAD is also a database of information.