Cleaner applications menu?

Is there a way to clean up OpenSuse’s applications menu with alacarte? It takes forever for me to find an existing menu item if I want to change or delete it, but deleting existing pre-defined groups (such as “Amusement”, “Art and Culture”, and “Games for Kids”) doesn’t work. They simply won’t delete.

Would be nice if you told which version of openSUSE and which desktop (KDE, Gnome, other) you are using. It may help people to understand what you mean.

11.2 with Gnome. It comes installed with alacarte.