u/Er0r0

Hi, so I have this huge problem and there's no video on youtube that I know of that can help me. For context: I have OPL running on an HDD. Let's take for example GTA SA. How can I insert multiple mods of GTA SA and play them separately? I know that it has something to do with the Game ID, but will it crash the game ? I need to install various mods of GTA SA, and everytime I load them, they all overwrite. Please help!