Expense transaction reports by identifier or custom ID?

I am trying to find a way of setting up an expense transaction report for any suppliers that identify as Aboriginal or TSI.  I created an identifier for that and applied it to a supplier but can't find a way of getting a list of purchases customised by that identifer.  I can't see any advice online for this, does anyone know of a way that I can easily achieve what I am after?  An id by job or expense account numbers will not work as we need those to stay as they are for other reporting purposes.  Thanks.