Is there an established way to group occupations based on the 1990 occupational codes?

#1

I want to group occupational codes based on the 1990 classification system (occ1990) into slightly more aggregated categories (not a highly aggregated system based on one digit, but perhaps two digits). Is there an established document that allows me to do that systematically?

#2

One reasonable way to aggregate these codes is to use the occupation headings as listed on the codes tab. That is, OCC1990==003 - 022 are Executive, Administrative, and Managerial Occupations, OCC1990==023 - 037 are Management Related Occupations, etc. I’m not sure if this sort of aggregation is exactly what you are looking for, but it is a fairly reasonable approach.