I need help with a financial model I created for a start-up. By way
of background the model is a five year month by month income
statement, BS and statement of cash flow that is fed by four or five
assumptions pagers. The model feeds into an executive dashboard. The
dashboard is a summary of information and includes a table for
calculating the IRR.

I am able to formulate the dashboard to calculate the IRR however I am
stumped to allow it to calculate the waterfall so that when I increase
revenue assumptions it feeds the waterfall breakdown. I want the
model to be able to calculate dollar returns to the three Series (A,B,
and C) when the profitability of the model is increased.

The waterfall is as follows:
(i) payoff of any debt (ii) 100% to the Investors (series A) until
they have received a return of contributed capital, then additional
distributions of (iii) 70% to Series A until the Series A investors
an IRR of 30% and then 30% prorated to Series B and C, then additional
distributions of (iv) 60% to Series A until the Series A investors
receive an IRR of 35% and then 40% prorated to Series B and C, then
additional distributions of (v) 33% to each class thereafter.