SAP APO MACRO

Hi,

I want to calculate as follows.

My Horizon is 24 months...

but I want to calculate separately for 2014 and 2015.

For instance..I want to distribute 100/ 3 (3 months Oct,Nov and dec) - 2014.

and next month it should distribute 100/2 (2 months Nov and Dec)

for next year I should calculate

I want to distribute 100/12 (12 months Jan- dec) - 2015.

I don't want to change the macro every month instead it should calculate automatically.

Thanks,