I think you may need to hire a consultant for this. This won't be easy to hammer out via discussion forum. There are many, many unanswered questions that would have to be asked and answered. For starters, you would probably have one department table where you have one record for each department ( television, feature, animation, etc.) and then define related tables to track and record the various aspects of your audit process from there.
Just analyzing your audit process and determining what level of documentation needs to be generated at each step of the process could be a major job for an organization as large as Warner Bros.