Hi:
You must ask about the Elsawin.
It is an application of the vag group in which you can find how you should disassemble anything from any Vag model (Seat, Skoda, Volkswagen and in your case Audi).
In your case it is the A4B5, if I'm not mistaken.
To download it, you must ask about the links in forums such as Audi Ibérica or Seat Exeo.com. It is something expensive, depending on your connection, computer knowledge, etc., but people explain it very well and will help you.
You must register, and in some cases post up to 10 you see to be able to access the manual and documentation subform.
In the Exeo forum (A4B7 platform), there are foreros (which are milk) that could look at you how to disassemble something in particular for you and hang it on PDF.
I pass you links from Audi Ibérica (where you have a sub-training only for your A4B5 model):
www.audisport-iberica.com/foro/
and of the Seat Exeo Club (you will need to post 10 times to access the documentation subforum where Elsawin is):
Clubseatexeo.com/foro/
In this forum, as you will understand, it is used for the Seat Exeus models, so it is possible for someone to help you.
Another application that may interest you is Ethka, Donode will find the references of any replacement and its price.
I think it is complicated that there is a manual itself, but you must guide yourself for the Elsawin (I only know about Seat and A4B6 and B7).
As I tell you, if you don't want to get out of the application you can ask to disassemble something in particular. It is very easy for someone to help you (I don't have the Elsawin, I'm sorry)
luck !!