how to use historical data to the new project

[MANJULA R]

to develop a new project, historical data is used for quick estimation, In this case, how to map requirement mapping between old project data to the new project data

[Nic Brough -Adaptavist-]

There is not enough information in the question for us to work with.

What requirement mapping?  How do you want to represent this in your new project? 

What estimation metrics were you using in the old project and how do you want to do it in the new one?