return specific character read from right to left

[ruzaimi]

I'm having problem to figure out.. what is the
formula to return a value after a specific character read from right to left?.
what i want from the data to return with Year, Month,Date,Index

I cant use MID because the chracter length not same..

or if read from left.. can we only return data start after character "-" ?

Sample data (Co_Number):
CO_NUMBER
CDS-270314-001
CO-270314-001



Thanks