Indian CAR 67A
(5) Flight time during which a pilot is under dual instruction shall be entered in his log book as “dual” and the pilot giving instruction shall make entries in the log book of the pilot under instruction showing the nature of the instruction given.
(6) Flight time spent in performing, under supervision of a pilot-in-command, the duties and functions of a pilot-in-command may be logged as pilot-in-command provided the person is entitled and authorized to fly in command of that type of aeroplane by virtue of the ratings and privileges of his pilot’s licence. In all other cases, such flight time shall be logged as co-pilot with appropriate indication in the remarks column.
(7) The holder of a Student Pilot’s Licence may log as pilot-in-command only that portion of the flight time during which he is the sole occupant of an aircraft provided that, in the case of an aircraft which requires more than one pilot in accordance with sub (7) of rule 38A and rule 6B, he may log as pilot-in-command that portion of the flight time during which he acts as pilots-in-command of the aircraft.
(8) The holder of a Private Pilot’s Licence may log as pilot-in-command only the flight time during which he acts as pilot-in-command.
(9)The holder of a Commercial, Senior Commercial or Airline Transport Pilot’s Licence may log as pilot-in-command the flight time during which he acts as pilot-in-command. He shall log as co-pilot the flight time during which he acts as co-pilot.
Things might be different under FAA rules, but I think they are quite clear under DGCA rules.
If you are a PPL/CPL holder you can log flight time as PIC only when you are acting as PIC. In order to act as PIC, you need to have the appropriate ratings and endorsements. When under supervision, you may also log as PIC but again you need to have the appropriate ratings and endorsements. Supervision is not the same as training. When you are receiving training, flight time is to be logged as dual.