1) Sales underling 
• (n.) A person employed by an agent to transact the whole, or a part, of the business intrusted to the latter.
Sub·a'gent noun (Law) A person employed by an agent to transact the whole, or a part, of the business intrusted to the latter. Bouvier. Chitty. 
a person whose duties as an agent are delegated to him or her by another agent. · a person who works for or under the supervision of an agent.