The house we bought has both bathroom receptacles on one gfci circuit. Meaning that if you trip the circuit, you have to reset in the hall bath. Can I change out one of the receptacles in the master bath with a gfci to eliminate the footsteps to reset?
GFCI trips Are Not Normal
When a GFCI trips, that is a call to alarm. It is warning you of a dangerous appliance. Do not fall into the habit of "normalizing" this and just pushing the reset over and over.
Since they are not normal, "the footsteps" shouldn't happen very often at all. It's perfectly reasonable to wire GFCIs so that one device protects many outlets, since trips are supposed to be almost unheard of.
Replace the appliance because it's trying to kill you
People get fuzzy on this; they think GFCI trips are just a nuisance. No. If not for the GFCI, lethal electrical current would have flowed. In fact, it did flow. The GFCI stopped it fast before it could do serious damage. Otherwise, you would have gotten the full brunt. This appliance is trying to kill you. Really.
In North America it's best practice to use layers of safety, not bet your life on the performance of one safety system. Look at anything from nuclear reactors to airplanes, and you see "defense in depth". Here we use a competent double-insulated appliance (2 layers) plus a GFCI (1 layer).
If it only happens when you plug in or use an appliance, that's the one. For confirmation, take it into the kitchen and plug it into one of the GFCIs there. If it trips, then into the trash it goes.
If it refuses to trip there, there's a small possibility that other appliances left plugged in to the circuit are also contributing to the leakage. If so, unplug them. Otherwise it might be a wall wiring issue. Or longshot possibility, I am reluctant to mention this because everybody wants to jump straight there -- it might actually be a faulty GFCI, but that is unlikely!
"Oh, but I don't want to spend money replacing the faulty appliance". Except you're about to "treat yourself" to an expensive electrical-system upgrade. Instead, treat yourself to a new appliance! Most plug-in bathroom appliances are cheaper than a GFCI to say nothing of labor.
Yes, it's possible
Yes, you can rearrange the circuit wiring. If you discontinue use of GFCI
LOAD terminals, then you need a separate GFCI receptacle anywhere you want GFCI protection, and only that receptacle will trip. But as discussed, this is good money thrown after trying to save a bad appliance.
Assuming you mean the receptacle in the hall bath is a gfci and not the circuit breaker in the panel
Yes you can. Basically, connect each gfci receptacle via the line side of the upstream gfci receptacle.
On the gfci in the hall bath, move the NM cable going to the owner bath to the line side (It should be connected to the load side now). Anything on the line side will not be protected by the gfci. You can only have one wire on each screw, so you will need to add a short wire (pigtail), connect that wire to the screw and connect the original line wire plus the formerly-load wire to that wire using a wire nut.
In the owner bath, replace the receptacle with a gfci receptacle and make sure that any other receptacles in the owner bath are connected to the load side of that gfci (or alternatively, connect to the line side and use gfci receptacles everywhere).
Also note that a single 20A circuit can supply multiple bathrooms as long as the circuit only supply receptacles in the bathrooms.