Tracking Supplier Chargeback Data in Agile

We have a need to start tracking Supplier Chargeback data in something other than a spreadsheet stored on a company network drive.  Agile is being considered for this, especially given its flexibility with adding custom attributes and workflow routing rules.  The current thought is to subclass the QMS Problem Report class and create a new workflow specific to our needs.  Is this a good/appropriate approach?  Should something else be considered instead (another Agile object, a different tool altogether)?

Thanks in advance,

Drew