Sub-Sector show you the specific industry classification of a company.
Screen using industry Sub-Sectors
If you use Sub-Sectors as a filter to screen with – see drop down list below Sectors – the screener will only select companies in the selected industry Sector and Sub-Sector you have selected.
See Sub-Sectors as an output column
You can also select Sub-Sector as output column.
This will allow you to see what industry Sub-Sector a company is active in.