How to start a return for another person based on their last year's return - desktop version? Files are on my computer.

When I started my return, TurboTax helped me populate it based on my last year's return. Now I want to start a return for another person and populate it based on their last year's return. 

Last year's return in both cases was done using Mac desktop version of TurboTax premier. All the files are on the same computer.

I can't see a way to do this.