I need to learn how to shift data right or left in columns based upon an
input. For instance, let's say I take 10 orders in January. I have a
constant value that assumes it will take me 4 months to build them. I then
want to show 10 sales in May (4 months after order). If I change the
manufacturing assumption to 3 months, I want the 10 sales to reflect in
April, one column to the left.