A wireless subscriber unit (200) determines (502) a billing mode applicable to a portion of a call, and generates (508, 518) partitioning information for the portion of the call, corresponding to the billing mode. The wireless subscriber unit and a consolidation system (300, 400) cooperate to partition (514, 526) the billing charges between at least two billable entities, based upon the partitioning information. A method of partitioning is also described.