Can you wire a 15 Amp receptacle or socket outlet for a 15 Amp plug on a 30 Amp circuit And would this not work if you protected the receptical with a GFI plug?

No, it would not be safe. DON'T DO THIS! If anything went wrong with an appliance plugged into that 15 Amp socket outlet there would be a serious risk of starting a house fire or someone could get electrocuted. The reason is that the breakers on 30 Amp circuits would not cut the power off if an accident happened or something went badly wrong inside an appliance that takes less than half that 30 Amp current. The current draw would be even less if it was a table lamp or something equally small. As you asked this question here you may not really know how to handle household AC power circuits safely, so be sensible: call a licensed electrician to install the correct circuit breaker and the right size of wiring to power any new 15 Amp socket outlets you need in your house, so that you and your family can use them safely.

ALWAYS CHECK WITH YOUR LOCAL WIRING SAFETY OFFICE BEFORE YOU ATTEMPT TO CHANGE ANYTHING

- ELECTRICAL SERVICE PANEL, BREAKERS, CABLES OR OUTLETS -

ON ANY ELECTRICAL POWER CIRCUITS

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the power

at the breaker box/fuse panel BEFORE you attempt to do any work AND

always use an electrician's test meter having metal-tipped probes

(not a simple proximity voltage indicator)

to insure the circuit is, in fact, de-energized.