It's important to know if you are using 2011 or something older...
But the basic idea is this:
Start with a blank document.... From a stock library import the following: Default Instrument Texture, Light Record Info, Light Record Info M, Parts, and the 3D C-clamp.
Create the 2D and 3D portions of the instrument. Give all the 3D portions the Default Instrument Texture.
If you are using 2011:
......1. Make sure all the geometry in the 2D part is on the screen plane.
......2. Give all the 3D geometry the Default Instrument Texture.
......3. Use groups or solid additions to make sure there are only 4 objects in the 3D part of the symbol:
_______1. Clamp
_______2. Yolk
_______3. Body
_______4. 3D Locus
If you are not using 2011, feel free to have as many objects in the 3D part as you wish. (just found out yesterday: 2011 does NOT like NURBS curves or 3D polygons in the 3D part of a spotlight instrument symbol - stick with regular 3D geometry)
The center of the clamp should be at 0,0,0. The 3D locus should be in the center of the body. (When rendering the light will originate at the 3D locus).
In 2011 make sure the instrument is pointed straight down. In all other vintages you can tilt the body to whatever angle you like.
In 2011 attach the record format "Parts" to the clamp, yolk, and body in the 3D part of the symbol. Select the clamp, click the data tab on the OIP and change the Clamp field to True. Repeat for yolk and clamp. For other vintages of VW skip this step.
Go to the 2D part of the Symbol. Deselect everything. Attach the Light Info Record. In the Data tab of the OIP enter all the info.
Exit the symbol.
Good luck!
mk