Are they independent of each other, or are they slaved? I have never used slaved motors, but I assume they would jog together.
Either way....
This will do what you want. It is linked to the jog velocity, so changing the Jog Rate % in the jogging tab will adjust how fast this jogs.
So, make your button or buttons to jog your multiple axis.
I have noted on the first instance the conditions for the JogVelocityStart and JogVelocityStop.
inst, Axis#, and Direction.
You may want to add 1 button to jog Postive and another button to jog Negative.
Once you make your button, do the following.
Put this in the Down Script for the button
--Start Jogging
local inst = mc.mcGetInstance()
mc.mcJogVelocityStart(inst, 0, 1) --inst, Axis#, Direction 1 is positive and -1 is negative.
mc.mcJogVelocityStart(inst, 1, 1)
Put this in the Up Script for the button
--Stop Jogging
local inst = mc.mcGetInstance()
mc.mcJogVelocityStop(inst, 0) --inst, Axis#
mc.mcJogVelocityStop(inst, 1)