Upgrading cabins to get more basements in single player

[regular_kahuna]

I've seen YouTubers with farms that have multiple upgraded cabins with basements so they can have more casks, but they're still playing single player (clock still pauses when they open their inventory, etc). How can I get these on my farm without having the multiplayer changes like a non-stop clock?

[Maya-Neko]

Save files aren't limited to either singleplayer or multiplayer modes. You can freely switch between those.

So just build your Cabins in singleplayer, then load the save file into multiplayer or coop and give the new farmers the ressources needed to upgrade their cabins. After they've bought the upgrades you can save at the end of the day and restart the game in singleplayer again.