If you are required to fly CAT A PC1, then you must fly a CAT A profile described in the RFM/OM. If a pilot modifies the profile, then the flight is no more operated with PC1.
To fly a PC1 profile, obstacle clearance must be assured, usually using pre-calculated plates. If required obstacle clearance is not assured, TDP and/or aircraft performance (weight) must be modified or another profile used.
That’s my understanding, but I’m happy to learn more.