That information makes things very much clearer. if you are asking a future question be sure to provide that level of info at the start.
Things are very simple if the motors do not need to stop at the same time.
All you need is code something like this
stepperA.setSpeed(sss)
stepperB.setSpeed(sss)
// etc
stepperA.move(mmm)
stepperB.move(mmm)
//etc
stepperA.run()
stepperB.run()
// etc
All the code won't go in the same place, of course. You might set the speed in setup() and set the movement in a function that takes input from the user. The calls to run() will go into loop()
...R