How do you free a stuck shoulder part of a seat belt system on 1994 Ford Motor makes noise?

By the fact that you are saying that the motor makes noise, I am assum ing this is a power seat belt, like on an Escort? If that is the case, then the fact that the motor is noisy indicates that the plastic gear tape, that runs the legth of the track is probably stipped, and so the shoulder belt is stuck wherever it is, and it's not going anywhere. You fix it, by replacing the assembly.