There are two places where custom code can be applied in Freedombase. They are:

- Templates, and
- Classes/Tables.

Templates can have Before, During, and After code applied. Classes/Tables can have Before and After code applied. Before and After are otherwise known as Pre and Post.

So, there are five combinations of custom code in Freedombase:

- Template Before Code
- Template During Code
- Template After Code
- Class Before Code
- Class After Code

The Class/Table (or Process) Before and After Code share the same parameter list as each other. The Template Before and After Code also share the same parameter list as each other. However, the custom code parameter list is different between Class/Table (or Process) and Template. Template During Code has it's own parameter list, that is not shared with any Before or After Code.

The five types of custom code serve and fullfill different purposes. Details of use and purpose for each type are described in the following pages.