Consensus forecast refers to a business process, not a 
system function. It basically means forecast created with 
the mutual agreement of the various business functions, 
e.g. supply chain, finance, sales, etc.
As such it is not linked to any statistical forecast models 
(I assume you meant that) and you can use any and all 
models, it will not create a consensus forecast for you.
You have to take your numbers and discuss and agree about 
them with your colleagues of the different departments. 
That's what will make your forecast consensus based.

In simple consensus forecast is arriving an average figures 
by taking eg.. production forecast qty, marketing 
forecasting qty and planned qty.. and so on..

Eg. Production forecast:200 nos. Marketing Forecas qty:250, 
you can arrive the consesus forecast qty is 225qty.

I hope this will help you..

MOHAMMED
SAPTEQ GLOBAL CONSULTING SERVICES,
SAPTEQ@GMAIL.COM
WWW.SAPTEQ.COM