If you are using Windoor, you can use the vertical divisions to create a full height door with ½ height sidelight next it. With the standard Vectorworks doors and windows you can’t create this object using the same technique, but there is a way to do it. create the door and sidelight that you require and make sure that the jam of the door in the sidelight overlap. Select the door and window. Make a symbol from them.
When you create a door, choose the option to use Symbol Geometry and use your door symbol. This allows you to use the door object and add it to your schedule.