cmgmjg88

I'm new to modding. I have downloaded somw of the Total classics Mods (1978, 1964) and I can load them. I want to know if there is a way to load several on and switch between them without having to overwrite files in the directory each time I play. For instance, How do I set it up so I have a1964 season going at the same time I have a1978 season going? Thanks for the help.