I am currently running a Call of Cthulhu game. The module is not available on Roll20, sadly, so I'm doing everything myself in the way of maps, handouts, etc. Part of the module that I am running has alternate timeline scenarios. That is to say, the basic era that the game takes place in is the 1920s which is the default for the Call of Cthulhu character sheet but there are scenarios that can be run with the module that take place in the dark ages (circa 1200), and the gaslight era (circa 1880). At the table, I can run these easily by just handing the players the sheets for characters from those eras (and, yes, they exist). But, I'm having to skip over these optional scenarios in Roll20 because there is no way for the players to have a character that uses the 1920s character sheet and the Cthulhu Invictus character sheet, and the Cthulhu by Gaslight sheet in the same game. I could probably fudge it with the basic character sheet but it would require a lot of effort and it's just not worth it. Having the ability to have multiple sheets would have been so useful...