Allright, here we go.
First you'll need to have a few named selection in your model.
I have named this selection in 1.000 lod
glass1:
This selection in Fire Geometry lod is also named
glass1:

It has following material:
ca\data\penetration\glassplate.rvmat
And finally this one in Hit-points lod is also
glass1:
Now lets give the
glass1 selection in 1.000 lod a material, say
my_car\glass.rvmat and we should be done in O2.
In model.cfg we'll need a new skeleton bone called
glass1. Here's an excerpt from our model.cfg:
We also need new animations for our glass:
There, the hard work is done now.
Finishing touches are done in unit's config. First we'll need a new hitpoint:
And then damage textures:
I wrote this rather quickly and I trust you have the needed O2, model.cfg and config skills to do the steps right

. But ask of course if you run into problems. OBMAR's tutorial is quite obsolete in A2.