I have a 2 column log that tracks incoming call amounts from agents
identified as 6 digit numbers CCOOAA - County, Office, Agent#:

171917 4
174327 6
171629 9
174327 13
172832 5

I want to add another table that takes ONLY the first 4 digits from the 6
digit number, then adds the totals from their call amounts. IN the example
above, for 174327, it would equal 19. (13+6).