The origin determines the orientation of the assembly in relation to the project orientation. The planes of the origin determine how the assembly is oriented in the corresponding elevations when you create assembly views. When you change the type of an assembly instance, the origin of the new type is applied to that instance.
The marker for the assembly origin displays as shown in the 2D and 3D examples below.
The selected instance is converted to an instance of the selected type.
You can now move the element, change its properties, or perform other typical element edits.