If different locations in same org then, period, position, city, Country, If same location, the position at the time of retirement is good.
So, careful while putting the durations, Because they verify the same the Resume, which is asked under supporting document of applicant #4.
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Checklist #3 IMM 5669 says :
IMPORTANT: For this form to be accepted, it must be complete (including no gaps in time for education and personal history in sections
C and D).
Note: For section D, if the principal applicant or a dependant has not worked in the past 10 years (e.g. they are retired), they must provide details of their personal history since the age of 18.
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So, Resume and 5669 C & D should match..