IBM Apptio

We have recently rolled out Bill of IT to our stakeholders, with an emphasis on price based recharges as a starting point. Our next challenge is to identify a method by which we can carry cost based recharges through the model and subsequently, to BoIT. I was wondering if you anyone can help shed some light on the methodology you've used to carry these costs from the cost source to business units. Several key issues we’ve encountered so far include;

1. Detailed breakdown of the expense line in the GL – e.g. Lenovo monthly invoice not breaking out the individual components of the bill (laptop repairs)
2. Marrying the GL expense lines with details around the charge (user details / profit centre)
3. Aligning the date at which recharges are processed vs when we receive the vendor invoice

 
Any advice or guidance you can provide in this space would be greatly appreciated! 

Regards,
Michael