源脚本或脚本的某些行

I have multiple R scripts for different models and I need to make it easily accessible for other people to use. So I would like to have one script in which only contains sources to run the other scripts without people having to search through many files to find the right one. some of the scripts have more than one model in so if possible I would like to source only specific blocks of lines from those scripts.I have multiple R scripts for different models