Designing Capacity for a month !

Hi :

QUESTION 1:

In OP4A - Define Shift Sequence via Grouping (Work Break Sch., Shift definition & Shift Sequence).

I understood how the functionality works for 7 days @ 3 Shifts.

But how this is transformed to a Months (30 Days).

QUESTION 2:

What is the purpose of "DEFINE PERIOD PATTERN KEY" via OP11. Where we use this key.

QUESTION 3:

In OP4A we already defined grouping which contains shift start/end time and we assign the same in OP36 - Default Capacity. Then why we need to specify the start/end/break length again in OP36 under Standard available capacity.

Thanks in Advance,

Dinesh Kumar V.