Hi,

I am creating a business model for an Internet portal. Obviously I
used Excel to create this model, unfortunately I ran into the
following problem.

I created a worksheet that calculates the turnover in a couple of
steps. The main input variable is the number of portal members.  In a
second sheet I made a prognosis of the number of members for the
upcoming 3 years (per month). Now I want excel to calculate the
turnover per month using the calculation in the turnover sheet. I have
no clue how to do this.

I assume it can be solved using VBA but I prefer to keep the worksheet
with the calculation intact since it contains a lot of steps (nicely
formatted to increase readability) to calculate the turnover.

Thanx,
Jerry