How to design:Use One TCPIP Client connection to Server and work concurrently

[ray]

Hi all,
  The system use ONE tcpip client and connection to server.
A large batch transactions send to server.I want to send to server concurrently.
any idea ?
In my thinking,
 A.Devide large batch transactions to small batch transactions.
 B.Create multi-thread or multiprocessing to process small transactions.
 C.No idea at how to control multithread using  ONE client concurrently?
   Each small transactions do not need to wait others
Thank for your suggestions.