Sorry to revive an old question, but it keeps appearing in response to searches on another topic, so I thought I would answer it.
There is/was/still is a big XML file containing your project configuration in R12, though the UI to access it is now gone. Given that Apptio CT lacks the ability to search through the model (i.e. to refactor the name of a column or table similar to trace precedents/dependents in Excel) the next best thing is to search through the XML file.
We wrote a basic XSLT transform to make it more human-readable as a web page and generated cross-linked documentation of table dependencies, formula references, etc. We shared the transform with our CSM in the interest of seeing something similar in the product, but have not heard anything since completing the refactor and closing our ticket.
Current and future readers may benefit from knowing that this exists and is possible!