What would one call/name a specialist negotiating unit that is a section or sub-unit of a procurement function of a large multi-national corporate in order to clearly identify such a unit..

This (currently unnamed) procurement sub-unit/section is the lead negotiating function that acts on behalf of internal company users in a decentralised procurement environment with the sole focus of delivering professional negotiating services to the operational business units that rely on the overall procurement function to provide cost effective, right quality, fit for purpose goods and services to ensure that operational delivery functions optimally.