The Timetable Structure is common to all categories. If you have a 10 day timetable, it is it for all categories and cannot be modified for different categories.
Day Names are common across all categories. You cannot have a different set of names for different categories or resources.
You can vary the number of sessions per day for each category.
One Category might have 6 sessions based on 6 periods per day, another category might have 14 sessions based on half-hour time blocks.