thanks for your reply. I'd like to order the cpts manually in the backend and show this order in the frontend. It should be easy and not to complicated, because the client should do this in the future. The order of the individual cpts can change monthly: they are dishes of a restaurant.
I created taxonomies for starters, soups, and so on and like to define a custom order of the related dishes, so that the client can add dishes and change the order of it easily.