With Combo, your employees can be excluded from the schedules but still have access to them ! All you have to do is un-check the "Employee can be scheduled" option in your employee's profile.
Go to the employee’s profile > Time and scheduling section :
Un-check the "Employee can be scheduled" option in the "Display on the schedule" section.
Good to know:
Only admins and directors have access to this option (on employee, manager and director profiles for admins only).
If the employee had shifts or absences planned before taking this step, then these are hidden and not deleted. They will reappear on the schedule if you tick the option again.
If your employee has completed their contract, do not un-check this box; they will automatically disappear from your schedules the week following their last day.