Each interval needs to be nested within the others. For example, Year 1 includes January, which then includes phases A, B, and Both. February includes A, B, Both, and so on, until December. So the phases are nested in the month, and the months are themselves nested inside each year.
In the Editor, under Turn Counter, add the first interval, Year. Right click and choose Add Counter. Set up the Year for the module, including starting date. Click OK.
In the editor, right-click on Year, and pick Add List. This will be the list of months in the calendar. In Description, call it Month. Set up your list of items, which in this case is each month of the year. (You’d start with August and work through to July.) The Turn counter will cycle through these every year in the order of the list. Click Ok.
Back in the Editor again, right click on Month, and set up another List. In Description, call it Phase. In this list, you add the list of Phases (A, B, and Both). These will be cycled every Month.
(When you’re all done, in the Editor, you’ll have the Year branched from the main Turn Counter, the Month will branch from the Year, and the Phase will branch from the Month.)
Also, in the Turn Counter properties, you may need to tweak the ‘Turn Name Format’ to correctly show Year, Month, and Phase in the Turn Counter window (This would be $level1$, $level2$ and $level3$, correspondingly).