Ah, yes @KARTHIKNAGURU . You're getting to the heart of L2 now with that formula.
The basic idea is that you need to take the baseline forecast and apply a growth percentage to it. So the "default forecast" would equal that. The tougher question, the one you may be wondering, is how do you calculate the baseline forecast? A hint: In your SYS01 module you calculated a 1st Forecast Year Boolean. Start with a calculation that uses that Boolean and figure out which periods are historical and which are forecasts. If it's historical there's nothing you can do to that number since it's elapsed. If it's a forecast, can you think of a function that will let you look back in time for the same period? That will set your base forecast to be used in your "default forecast" line item.