1) Create first a group
2) Under this grouping: create work break schedule, identify each of them with distinct number. Under each break, you can various (2 or 3 or 4 or any number )break numbers. e.g. 9-9:30 for B/fast, 12-12:30 for lunch and so on
3) Create shifts per day in the shifts data, mention the time of oeprating for each shift and assign the break( under break, you have multiple break numbers)
4) IN last step of 'shift sequence', create one unique sequnce under which you can define which is the first,second shift under that sequence. Now for each working day, you can assign the earlier created shifts for each day.
Once this config is ready, you need to assign, the grouping and factory calendar in work center. Also maintain the same, in 'shift sequences' in work center, the validity date for the shift sequences.
Regards,
Mahendra