There are twenty "Main" areas defined as Expertise Specialisms for you to use as "keywords".
Each "Main" choice also lets you view a "Subsidiary" choice related to the "Main" area. e.g. "creative development" related to ADVERTISING.
This is undertaken by selecting the "Main" keyword and then clicking a checkbox to display the associated "Subsidiary" keywords.
You can choose using either "Main" or "Subsidiary" keywords.