Using Pre-processor Macro,how to change file name for Development, staging and production Environment ?

Problem statement:- I am using third party library, which need to have config.plist(name must be same), Config.plist have several key-value pairs, for production,Dev and stating environment, values for key does change. Right now i need to manually change file Name, like if i need to run app in production environment, i do change file name ConfigPROD.plist into Config.plist, for Staging i do change file name from ConfigDev.plist into Config.plist.

Need Solution like:- can i change, file content using preprocessor macro, like

    #if isProductionBuild == 1
    #define kBaseURL @"https://api.base.com/bart/"
    #define kEnvironmnet @"PROD"
    ***//copy ConfigPROD.plist file content into Config.plist***

#elif isStageBuild == 1
    #define kBaseURL @"https://api-stage.base.com/bart/"
    #define kEnvironmnet @"stg"
     *//copy ConfigSTG.plist file content into Config.plist*
#else
    #define kBaseURL @"https://api-dev.base.com/bart/"
    #define kEnvironmnet @"dev"
     *//copy ConfigDEV.plist file content into Config.plist*
#endif

pleae see if we do have feature like "copy ConfigDEV.plist file content into Config.plist"

Note:- This file copy operation should get completed before third party library start using Config.plist.