Manufacturing shifts vs personnel shifts
They can be aligned, but answer different questions. Manufacturing needs a global production calendar. Personnel needs to know when each employee is expected to work.
How you define it
You can configure several time slots for the same day. Time outside them is considered non-working time for manufacturing planning.
The schedule does not support closures or exceptions by date. Use Personnel shifts and calendars to plan employee availability, not to change these global working hours.
Editing manufacturing working hours requires advanced planning in your plan. This condition does not affect Personnel shifts and calendars.