Thanks for Matths comments.
The web page matth has provided is very helpful, and if anyone wants to start your simulation from steady state, you should take a look.
I found some details on simulation continuation and more commands from User Manual 1, "Simulator API" section.
Here's one more additional question based on this one,
Is there an equivalent C function in the Dymola/source folder of ImportInitial(), Or ImportInitialResult()? Thanks.