2. The method of claim 1 , wherein setting a set of pricing sub-models comprises setting a first pricing sub-model for a group of billable items and setting a second pricing sub-model at a second instance through an administrator interface.
2. The method of claim 1 , wherein setting a set of pricing sub-models comprises setting a first pricing sub-model for a group of billable items and setting a second pricing sub-model at a second instance through an administrator interface. 3. The method of claim 2 , wherein the first pricing sub-model is set at a first instance and the second pricing model is set at the second instance that is substantially distinct from the first instance; and wherein the first and second pricing sub-models are set through an administrator interface.