Read this article and watch this video to learn how to create full cardigan knitting.
To create a full cardigan structure in the software, first create a double jersey structure.
Now add a row of combined knitting and tucking on every other row. One row of "Knit & Tuck" (Front knit and rear tuck) and one of "Tuck & Knit" (Rear knit and front tuck).
Below a detail of full cardigan knitting.