Tip - the page supports pasting from Excel and a calendar may more easily be created there.
Each row of the Calendar must be checked-on as Enabled. Period Number is the count of pay periods being defined; Fiscal Period is the number of the month to which it is to be budgeted.

Technical Note:
The following SQL query may be run to jump start this calendar:
Select * from {CompanyDB}.dbo.sy40100 where series=0 and Year1=@Year