Modify the Pigskin spreadsheet model so that demand in any of the first five months must be

Question:

Modify the Pigskin spreadsheet model so that demand in any of the first five months must be met no later than a month late, whereas demand in month 6 must be met on time. For example, the demand in month 3 can be met partly in month 3 and partly in month 4.
How does this change the optimal production schedule? How does it change the optimal total cost?