These are the codes used in Paymas, which is basically the Payroll system for every woolworths division (afaik), it's kind of like Host but for people not products, and it entirely controls how much you get paid and stores all your personal information. There are, thousands, if not hundreds of thousands of different codes for different things because it is used accross all divisions, e.g. i'm a MGMT1012 (Non Salaried Department Manager) working in company 1001, brach 1360, in department 121 (checkouts). Then there are all the codes for additions/deductions for pay and non worked hours, F8 is First Aid, A2 is higher duties allowance, CJ is TOIL, SA is sick leave, AA is annual leave, SZ is sick pay not paid, AZ is annual leave not paid, CU is Other Non Paid Leave, JA is jury duty, PA is public holiday not worked, CP is closed public holiday, NA is picnic day.
as for the specific codes, the 3 denotes your a casual, and the letter is the loading
so 3A is Casual Ordinary Hours
6A is PPT/FT Ordinary hours
3J is Casual + 50% loading (for sundays in NSW i use it for at least)
not sure about 6M, i'm guessing after 12 on some day or another
6S is Ordinary Hours + OT150%
6T is Ordinary Hours +200%, you get the idea
i'm alsmost certain 3X CPHW270 stands for Casual Public Holiday Worked 270% loading.
all the codes are on Storenet, just search for the Paycode sheet for TAS