The Request Category is the top level of Request Classification.  When adding or editing Request Types the Category is looked up from this list.  When adding a new Request - either yourself or a customer, will not see the Category.  Instead, when a Request Type is entered the Category is looked up behind the scenes from this table.

The Category Lookup Table is shown below.  Double click on a Category Name to edit the Category or click the + button to add a new Category

The next screen shows the web page used to add a new Category.

The Category Name is required and must be uniqu.