Yes, as long as none of the scheduled time pairs overlap. If an employee has multiple schedules on a day, the icon is displayed on the corresponding date in the Monthly Schedule calendar. To view the details of each schedule, click the date. Each scheduled time pair is listed in the left pane of the Edit Schedule page. You can click each time pair to view more information about each schedule.
It may be that your employee did not have an existing schedule. The Non-Work Scheduler replaces existing schedules with time pairs assigned to non-work earnings codes. It has no effect on days that do not already have a schedule assigned to them.
Yes, an employee can be assigned multiple recurring schedules, as long as none of the assigned recurring schedules have the same start date. Although multiple recurring schedules can be assigned, only one recurring schedule (the one with the latest start date that has already passed) is in effect per day.
You clicked the Delete button from the Edit Recurring Schedules page. Whenever you click the Delete button on this page, the recurring schedule is removed for the entire date range to which it was assigned (even if you attempt to edit the start and end dates before clicking the Delete button).