Adding a Chartfield post go live

Covance (My employer) is working in a 9.1 version of PeopleSoft and our chartfield configuration is not allowing us to do the financial analysis that is desired.  We have implemented using the Operating Unit Chartfield to reperesent business lines and locations. We also are using Dept, Account, Project and Activity chartfields.

The logic in our Operating Unit numbers, however,  is starting to breakdown because of the way our business is expanding and re-aligning. One of the options we have considered is to add an additional chartfield that we currently do not use. The current OU number has in it the Business Line (2 digits) and the Location (3 digits). We are thinking about breaking this apart and having the Business Line and Location as separate fields and not sure what impact this might have overall.