@ReneStC
You will have to run separate reports for the following objects:
- Project
- Task
- Request
- Documents
The field you are looking for is "Category: Name"
If you add it as a column, you can easily click on the form and see what information is filled out on that specific object.
I recommend added it also as a prompt so you can easily filter through the different forms you are trying to potentially audit.
Hope that helps!