How to play two save games at once? (Especially appreciated from youtubers that have multiple LPs)

well I'm no youtuber but when you have more than save you can just load whichever you want to play and leave the other till you want to go back to it. I usually bounce between saves, now I have newer save with the Goths Bella was unfaithful to Mortimer but in my older save with them they passed together peacefully after just enjoying their family I prefer to have a lot of saves :)