Hi

As far as I am aware the Bibliography part of Word is not customizable but several pieces of software exist (which I am sure you might get your dept to purchase as they'll be useful). Biblioscape 9 cost $49 for educational use and should do the job you want. Alternatively Reference Manager will work too but more expensive.

For MAC users there's a plethora of options but sadly not so many for windows.

Also try putting your references in as "endnotes" which can then be collated at the end of a section say chapter...might work for you