Read this article and watch this video to learn how to create half milano knitting.
To create a half milano structure in the software, first create a double jersey structure.
Now add a row of single jersey on every other row. You can choose whether you want these single jersey rows to be knitted on the front or rear bed, as long as they always happen on the same bed.
Below a detail of half milano with front bed knitting (top) and rear bed knitting (below).