How to set transferred boundary condition?

Two same heat exchangher modles in series, the first heat exchanger output goals will act as boundary condition of seconds exchanger, I consider use two cases simulation, We often use transferred boundary conditions, but it need use first result files "**.fld", The questions is: if I consider use batch run (however first case not run, no "*.fld" input),I want to know how to set the transferred boundry condition?