Read this article and watch this video to learn how to create shaped panels for your knitted garments.
Go to stitch view in the design app. Open the stitch selector in the toolbar on the left, and select the stitches to knit no stitches on front and back (x/x) and draw a selection with the rectangle tool across 6 rows to create black (empty) rows. Remove the same amount of columns, as stitches that you're decreasing, in the area above the rows of (x/x).
Open the stitch selector again in the toolbar on the left, and select the stitches to transfer to the back bed and draw rows of these transfers to the back bed in an alternating fashion (as seen in the video) as this method transfers the stitches best.
Open the stitch selector again in the toolbar on the left, and select the stitches to transfer to the front bed and draw rows of transfers to the front bed in an alternating fashion like before but staggered in such a way that the first rows have transfers on the left side and the next rows have the transfers on the right side.
Rack the bed by -1 for the last 2 rows of front transfers (by changing the number in the left table) and rack the first 2 rows of front transfers by 1 (also in the table).
It is important not to forget to adjust the speed and the takedown when shaping. The machine needs a reduced speed to transfer successfully and a reduced takedown to limit the amount of movement of the rollers, otherwise the takedown will cause the yarn to break on those stitches. You can read more about adjusting the speed here and learn more about adjusting further variables like takedown here.