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FYI: 2 & 3 digit SICs
You don’t have to select 4 digit SIC individually. In the Industry module select the blue ‘SELECT SIC CODE FROM LIST” button and then you can select 2, 3, or 4 digit SICs.
To expand (or contract) the 2 and 3 digit SIC groups click on the SIC name.
For more on this See the FAQ on SICs.