I'm doing up a schedule to predict production levels for work. The
product proces is made up of 5 stages. The columns represent each
month. What I want to be able to do is have a variable that the user
can change so that they can vary the number of months between stages.

For example, if stage 1 only takes two months, then formulas in X will
reference values in W. If the user wanted to extend the process by a
month to see the ramifications, they could change a value and all the
formula's would then reference V column instead.

Any ideas much appreciated,

Cheers

Reg