@Aurora11 If I understood correctly, the OP wants categories, which is not possible AFAIK with either pedlist.xml or favoritepeds.xml.
Pedlist does have categories but I was unable to add one. Interestingly, you can delete pedlist.xml and it will still display the peds in Menyoo - even though the list is no longer there. So it generates that menu internally with or without the list.