Mike,
in a workstation, like in a synthesizer, you can program and save what you have programmed... only it's not called a "registration" but a "patch" or a "multiprogram" instead.
The number of patches you can save depends on the memory available: usually they are 128 for each bank of memory, because they have to be called-up by midi program changes.
In Roland workstations the number of "multiprograms" (which correspond more to the concept of "Registrations" according to Yamaha) is much more limited and this is a shame, because "multiprograms" give you a greater degree of flexibility in programming sounds for your left and right hand or for each midi channel.