Sorry for the long post but this is what CASA wants you to do straight from their web site, even some of the CASA log books have reference in the front to AIC/rules which are out of date or incorrect.
Gundog - The red text is the area you may be interested in, all they care about is that it is instrument flight time and logged as such.
Logging of Flight Time
Flight time may be recorded in hours and decimals of hours, or hours and minutes. Pilots should record flight time accrued under the definition given above as follows:
Check Pilot/Approved Testing OfficerWhen not designated as pilot in command, flight time may be logged as co-pilot. In addition, the time may be recorded in the 'Specialist/Instructor' column as a record of check pilot experience.
Co-PilotIncludes all flight time as co-pilot or second officer. This flight time must not to be added to Grand Total Hours or Total Aeronautical Experience when ICUS is logged.
Dual FlyingDual time is recorded in the single or multi-engine dual column.
Flight Simulator or Synthetic Trainer TimePractice in an approved simulator or trainer may be recorded in the section provided at the rear of the log book. The instrument flight element of the simulator time may be transferred to the 'Ground' column of the Instrument Flight section of the flight record.
If a Flight Simulator or Synthetic Trainer Practice section is not available in the log book, the details may be entered chronologically in the flight record, and the Instrument flight element transferred to a suitably titled column.
In older log books, the 'Ground Training' or 'Simulator' column of the Instrument section of the flight record may be used for 'Ground' entries.
Grand Total Flying HoursGrand Total Flying Hours is calculated by adding all numbered columns in the flight record, plus ICUS, and recording the total at the bottom of the page.
In Command Under Supervision (ICUS)Includes all flight time when assigned as co-pilot acting in command under supervision as defined above:ICUS may be logged as follows:
a) in log books with single and multi-engine ICUS columns, the flight time is logged accordingly and is included in the Grand Total Hours;
b) if the log book does not have an ICUS column then ICUS may be logged in the Pilot in Command column as long as it is clearly identified as ICUS and the pilot in command is also identified;
c) alternatively, another unused column may be used to log ICUS.
Instrument ApproachesThe number and type of approaches may be recorded in the Instrument Approach column as a record of recent experience. If such a column is not available in the log book, the number and type of approaches may be recorded in the Remarks/Route, or another suitably retitled unused column.
Instrument TimeInstrument time is recorded in the Instrument column as either 'Flight' or 'Ground'.
Instrument Flight TimeAll flight time during which the aircraft was controlled solely by reference to instruments may be recorded in the instrument 'Flight' column:
a) Time above overcast or at night in Visual Meteorological Conditions (VMC) is not counted as instrument flight;
b) In actual or simulated instrument conditions, only the pilot manipulating the controls or providing input to the auto-pilot may log all flight time as instrument flight;
c) A flight conducted on an Instrument Flight Rules (IFR) flight plan is not to be counted as instrument flight unless flying in IMC;
d) Instrument approaches are to be credited to the pilot (pilots, in the case of an airborne radar approach) manipulating the controls or providing input to the auto-pilot during the approach.
Instrument Ground TimeVisual and instrument flight conducted in an approved flight simulator or synthetic trainer may be recorded in the appropriate section at the rear of the log book. The instrument element of a flight conducted in a simulator or synthetic flight trainer may be transferred to the 'Ground', 'Ground Training' or 'Simulator' column in the Instrument section of the flight record.
Mutual Instructor FlyingInvolves two pilots who are qualified on type, flying together for mutual practice on a flying instructor course. One designated pilot may log time in command and the other student instructor may log time as co-pilot. This flight time may be included in the Grand Total Hours.
Pilot In CommandIncludes all flight time while designated as pilot in command.
Route/Remarks/DetailsRecord all points of take-off and landing, nature of the flight (eg, mustering, aerobatics, scenic, etc) and, if required for recency, the number of landings.
Specialist/Instructor ColumnThe specialist column may be used for recording appropriate specialist activities; eg, glider towing, agricultural, check pilot, basic or navigation instruction. The activity involved should be clearly identified for each log book entry. This time is not to be included in the Grand Total Hours.
Summary of ExperienceThis section at the rear of the log book is available for use as required for type, periodical, seasonal or other summaries.
Total Aeronautical ExperienceTotal aeronautical experience is calculated by adding the totals of flight times recorded in each column but in such a way that that any flight time is not included more than once in the grand total hours.
Note also that only 50% of the time logged as a co-pilot may be included in the total.