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Hi Rafiu,
The best way to get a quick overview of the software is to go through the LEAP training materials which can be found here: http://tinyurl.com/LEAP-Training-Materials
Macroeconomic variables should be input into the Key Assumptions folder of the tree structure. You can see examples of this in the Freedonia dataset. For more information about key assumptions please see the documentation in the user guide, found here: http://tinyurl.com/y9vkp8h
LEAP supports various time-series functions for projected data that you could use for macroeconomic variables from 2000 to 2030. These include the Interp function, which interpolates between user identified data points, and the Growth function, which projects data based on user identified growth rates. To read more about these (and other) options, please see the user guide documentation, found here: http://tinyurl.com/y5dldqx
Take a look at these resources and let me know if you have further questions.
Tory