Select the stitches in the bottom row and set the selection in the Waste & Cast-on command.
Remember to enter all the colours you will use for your design in the Body Yarns field, typing in the numbers separated by spaces. The first number entered in the field is the one performing the cast-on. For the front and rear panels, add an additional yarn to split the section on the right side of the neckline.
Select the cast-on style and adjust any settings as needed.
After this, make the necessary needle arrangements (introducing transfers) to transition from rib to jersey or whichever structure you are going to use. There are different commands you can use for this: Free edit to paint, copy and paste transfers, Front<>Rear Transfers, Tiling…
