This is a retaining wall you can place down to make vertical walls on your farm. I highly recommend using the "Move Placeables" mod available on the in-game mod hub to get it where you want. I strongly suggest using a save game you dont care bout to get a feel for how both the retaining wall, and move placeables mod work. Play around with them before making any changes to a map you have dedicated alot of time to!
As always, Feedback is welcome! And please, enjoy!