Reduce voltage to many lower output with resistors
Reducing voltage for power supplies using voltage dividers will not work - any current drawn from the voltage divider will reduce the output voltage, and the voltage divider resistors will waste power.

You should use voltage regulators instead.  Depending on the current requirements at each voltage, it may be better to use switching regulators (DC-DC converters) rather than linear voltage regulators, as the linear regulators must dissipate the excess power as heat.