class/department list?

I'm new to front accounting, have a mainly Quickbooks/SQL background.  I am totally lost as to how to set up in FA what is traditionally called a "class list", i.e. a way of classifying income & expense by department (i.e. "class") for more nuanced reporting.

Any guidance you could give would be most welcome!

Departmental Accounting – separating operating divisions into their own sub entities on the income statement, showing individual income, expenses, and net profit by entity