i take the earnings from a collection of mortgages we call a mortgage pool and what i would do is take the earnings from 200,000 mortgages that make up the mortgage pool and i would model who gets paid what and when according to a formula my problem is i don't know what this job is called 

You didn't describe what value you are bringing to the table, so this isn't a job at all.

so i guess i would be part of FP&A