The drop-down menus in Clik Service are referred to as types and are used throughout the program.
To add, edit or delete a type you will need to be logged into Clik Service with appropriate permissions to access the settings.
Once you have the appropriate permissions, at the top of the program click settings > settings > types.
On the left list are all the default types. You can expand these by clicking on the small arrow next to them and you will see the items already set up.
If you right click on the description you can select to add a new item, which will insert a new item at the bottom of the current type. You can also then add a description as required.
You can also see in this menu that you can delete a sub item or description. If you delete a standard type, when you reload the settings screen it will reappear with no sub-items associated with it.