Capacity calendars refer to work capacity calendars. With capacity calendars you determine the length of users’ work day and week, balance calculation, absence days calculation and availability for resourcing in Work schedules. They contain public holidays and any special capacity days (such as non-work days for a part-time employee) for the user.
An user needs to be assigned to a capacity calendar and a correct capacity calendar must be available when creating a new user. You will need to have separate work capacity calendars for separate countries and separate calendars for part-time users.