Filing subpoenas?

[dipper]

DH will be representing self.  One of dh's reason's for going for custody is that ss is allowed to hang with anyone...and everyone that he has hung out with, and that bm encourages, is a bad influence.  Two children he hangs with are troubled children - much as ss is......and they are the two involved in him being burned......dh needs to subpoena school discipline records to hopefully back up the fact that they are agressive children and from what we understand, they were in trouble that week at school for agressive behavior....

Do you just go to court and ask for a subpoena - or is there a certain name for it?