Creating a civ leader mod component based of Tropico mod.

[Bangra 7]

After downloading the Tropico MOD for BNW, I figured I'd edit the Presidente LUA script, to allow a unit class to be chosen. This UNITCLASS_LEADER, will feature different leaders for my fictional nations in the MOD, and I want to be able to let multiple nations use the script. Do I have to create separate lua scripts based on the Presidente script, or can I simply edit the president script to make this happen?

NOTE: I am VERY much a beginner with lua scripting.