I am struggling with the problem for long

I have a total number of units to be produced say 2000 for product A and production is to be done in one year from Jan-Dec 2013

I want to create a bell-curve that would bi distributed from Jan-Dec. I was think if there is a method that would generate distribution of numbers for every month total being 2000 units and distribution represents a bell curve

please help

thank you in advance